How many questions from p-Block Elements appear in JEE?

p-Block Elements has appeared in 164 of the last 186 JEE Main and JEE Advanced papers — about 88% of them — contributing 276 questions in total across those papers.

Is p-Block Elements an important chapter for JEE?

Judged by how often it is actually tested, it appears in roughly 88% of papers. Chapters above about 50% are effectively guaranteed to show up every session, so they repay thorough preparation; lower-frequency chapters are better treated as targeted revision.

Where do these p-Block Elements questions come from?

Every question is from an official JEE Main or JEE Advanced paper, transcribed from the original paper and tagged to this chapter. Answers follow the official answer key.

p-Block Elements JEE Previous Year Questions with Answers

Q1·ChemistryMultiple correctJEE Advanced 2026

Correct statement(s) about the compounds P, Q and R is(are)

(A)P has two lone pairs of electrons on the central atom.
(B)Q has a perfect octahedral geometry.
(C)Q can act as a fluorinating agent.
(D)The molecular structure of R is trigonal pyramidal.

Q2·ChemistryMultiple correctJEE Advanced 2026

Reaction of

\mathrm{PtF_6}

with oxygen (

\mathrm{O_2}

) gas results in the formation of an ionic compound,

\mathrm{X^+Y^-}

. Correct statement(s) is(are)

(A)The bond order of $\mathrm{X^+}$ is 1.5.
(B)Valence $d$ -orbitals of the metal ion in $\mathrm{X^+Y^-}$ has 5 electrons.
(C) $\mathrm{PtF_6}$ acts as an oxidant in this reaction.
(D) $\mathrm{PtF_6}$ acts as a fluorinating agent in this reaction.

Q3·ChemistryMultiple correctJEE Advanced 2026

Correct statement(s) about the compounds X, Y and Z is(are)

(A)X is used for sterilizing drinking water.
(B)Y has a planar structure.
(C)Z is used in the enrichment of $^{235}\mathrm{U}$ .
(D)Y is a stronger Lewis base than ammonia.

Q4·ChemistrySingle correctJEE Main 2026

Find the correct statements related to group 15 hydrides. A. Reducing nature increases from NH

_3

to BiH

_3

B. Tendency to donate lone pair of electrons decreases from NH

_3

to BiH

_3

C. The stability of hydrides decreases from NH

_3

to BiH

_3

D. HEH bond angle decreases from NH

_3

to SbH

_3

(E = Elements of group 15) Choose the correct answer from the options given below:

(A)A and B only
(B)B and C only
(C)A, B, C and D
(D)A, C and D Only

Q5·ChemistrySingle correctJEE Main 2026

Given below are two statements: Statement I: Aluminium is more electropositive than thallium as the standard electrode potential value of

E^\circ_{Al^{3+}/Al}

is negative and

E^\circ_{Tl^{3+}/Tl}

is positive. Statement II: The sum of first three ionization enthalpies of boron is very high when compared to that of aluminium. Due to this reason boron forms covalent compounds only and aluminium forms Al³⁺ ion. In the light of the above statements, choose the correct answer from the options given below

(A)Both Statement I and Statement II are true
(B)Both Statement I and Statement II are false
(C)Statement I is true but Statement II is false
(D)Statement I is false but Statement II is true

Q6·ChemistrySingle correctJEE Main 2026

Given below are two statements : Statement I :

\mathrm{F_{2}O} < \mathrm{H_{2}O} < \mathrm{Cl_{2}O}

is the correct trend in terms of bond angle. Statement II :

\mathrm{SiF_{4}}

,

\mathrm{SnF_{4}}

and

\mathrm{PbF_{4}}

are ionic in nature. In the light of the above statements, choose the correct answer from the options given below :

(A)Both Statement I and Statement II are true
(B)Both Statement I and Statement II are false
(C)Statement I is true but Statement II is false
(D)Statement I is false but Statement II is true

Q7·ChemistrySingle correctJEE Main 2026

Treatment of a gas '

X

' with a freshly prepared ferrous sulphate solution gives a compound '

Y

' as a brown ring. The compounds

X

and

Y

are.

(A)NO and $[\mathrm{Fe(NO)}]\mathrm{SO_{4}}$
(B) $\mathrm{NO_{2}}$ and $[\mathrm{Fe(NO_{2})}]\mathrm{SO_{4}}$
(C) $\mathrm{N_{2}O}$ and $[\mathrm{Fe(N_{2}O)}]\mathrm{SO_{4}}$
(D) $\mathrm{N_{2}O_{4}}$ and $[\mathrm{Fe(N_{2}O_{4})}]\mathrm{SO_{4}}$

Q8·ChemistrySingle correctJEE Main 2026

Given below are two statements : Statement I: Aluminium upon reaction with NaOH forms [Al(OH)₆]³⁻ ion. Statement II: The geometry of ICl₄⁻, ClO₃⁻ and IBr₂⁻ is square planar, pyramidal and linear respectively. In the light of the above statements, choose the correct answer from the options given below :

(A)Both Statement I and Statement II are true
(B)Both Statement I and Statement II are false
(C)Statement I is true but Statement II is false
(D)Statement I is false but Statement II is true

Q9·ChemistrySingle correctJEE Main 2026

Correct statements from the following are: A. Nitrogen in oxidation states from

+1

to

+4

disproportionates in acid medium. B. Nitrogen has the ability to form

d\pi - p\pi

multiple bonds with itself and other elements with small size and high electronegativity. C. N-N single bond is stronger than P-P single bond. D. Nitrogen has highest density in its group due to small size. E. The maximum covalency of nitrogen is four since it has only four valence orbitals for bonding. Choose the correct answer from the options given below:

(A)B, C and D Only
(B)C, D and E Only
(C)A, C and E Only
(D)A and E Only

Q10·ChemistryNumericalJEE Main 2026

According to Lewis theory, the total number of

\sigma

bond-pairs and lone pair of electrons around the central atom of

XeO_6^{4-}

ion is _______.

Q11·ChemistrySingle correctJEE Main 2026

Given below are two statements: Statement I: The covalency of oxygen is generally two but it can exceed upto four. The oxidation state of oxygen in

SO_2

is

-2

and in

OF_2

it is

+2

. Statement II: The anomalous behaviour of oxygen when compared to the other elements of group 16 is due to its small size and high electronegativity. In the light of the above statements, choose the correct answer from the options given below

(A)Both Statement I and Statement II are true
(B)Both Statement I and Statement II are false
(C)Statement I is true but Statement II is false
(D)Statement I is false but Statement II is true

Q12·ChemistrySingle correctJEE Main 2026

The electronegativity of a group 13 element 'E' is same as that of Ge (on Pauling scale and upto one decimal point). The CORRECT statements about

E^{3+}

are A. It can act as a reducing agent. B. It can act as an oxidizing agent. C.

E^{3+}

is more stable than

E^{+}

. D. The standard electrode potential value for

E^{3+}/E

is positive. Choose the correct answer from the options given below:

(A)A and C Only
(B)B and C Only
(C)B and D Only
(D)A and D Only

Q13·ChemistrySingle correctJEE Main 2026

Given below are two statements : Statement (I) : Oxidising power of halogens decreases in the order

\mathrm{F_{2}} > \mathrm{Cl_{2}} > \mathrm{Br_{2}} > \mathrm{I_{2}}

, which is the basis of "Layer test". Statement (II) : "Layer test" to identify

\mathrm{Br_{2}}

and

\mathrm{I_{2}}

in aqueous solution involves the oxidation of bromide or iodide into

\mathrm{Br_{2}}

or

\mathrm{I_{2}}

respectively with

\mathrm{Cl_{2}}

, which is a type of displacement redox reaction. In the light of the above statements, choose the correct answer from the options given below :

(A)Both Statement I and Statement II are true
(B)Both Statement I and Statement II are false
(C)Statement I is true but Statement II is false
(D)Statement I is false but Statement II is true

Q14·ChemistrySingle correctJEE Main 2026

Given below are two statements: Statement I: The second ionization enthalpy of B, Al and Ga is in the order of

B > Al > Ga

. Statement II: The correct order in terms of first ionization enthalpy is

Si < Ge < Pb < Sn

. In the light of the above statements, choose the correct answer from the options given below:

(A)Both Statement I and Statement II are true
(B)Both Statement I and Statement II are false
(C)Statement I is true but Statement II is false
(D)Statement I is false but Statement II is true

Q15·ChemistrySingle correctJEE Main 2026

Consider the following reactions.

Na_2B_4O_7 \xrightarrow{\Delta} 2X + Y

CuSO_4 + Y \xrightarrow{Non-Luminous\ flame} Z + SO_3

2Z+2X+Carbon \xrightarrow{Luminous\ flame} 2Q+Na_2B_4O_7+CO

The oxidation states of Cu in Z and Q, respectively are :

(A)+2 and +2
(B)+2 and +1
(C)+1 and +2
(D)+1 and +1

Q16·ChemistrySingle correctJEE Main 2026

Regarding the hydrides of group 15 elements EH

_{3}

(E = N, P, As, Sb), select the correct statement from the following: A. The stability of hydrides decreases down the group. B. The basicity of hydrides decreases down the group. C. The reducing character increases down the group. D. The boiling point increases down the group. Choose the correct answer from the options given below:

(A)A, B & C only
(B)A & D only
(C)A, B, C & D
(D)B & C only

Q17·ChemistrySingle correctJEE Main 2026

Given below are two statements : Statement I : The increasing order of boiling point of hydrogen halides is HCl < HBr < HI < HF. Statement II : The increasing order of melting point of hydrogen halides is HCl < HBr < HF < HI. In the light of the above statements, choose the correct answer from the options given below :

(A)Both Statement I and Statement II are true
(B)Statement I is true but Statement II is false
(C)Both Statement I and Statement II are false
(D)Statement I is false but Statement II is true

Q18·ChemistrySingle correctJEE Main 2026

Match List-I with List-II according to shape. Choose the correct answer from the options given below :

List-I	List-II
A.XeO $_{3}$	I.BrF $_{5}$
B.XeF $_{2}$	II.NH $_{3}$
C.XeO $_{2}$ F $_{2}$	III.[I $_{3}$ ] $^{–}$
D.XeOF $_{4}$	IV.SF $_{4}$

(A)A-II, B-I, C-III, D-IV
(B)A-II, B-III, C-IV, D-I
(C)A-II, B-III, C-I, D-IV
(D)A-III, B-II, C-IV, D-I

Q19·ChemistrySingle correctJEE Main 2026

Among the following, the CORRECT combinations are : A.

IF_3

→ T-shaped (

sp^3d

) B.

IF_5

→ Square pyramidal (

sp^3d^2

) C.

IF_7

→ Pentagonal bipyramidal (

sp^3d^3

) D.

ClO_4^-

→ Square planar (

sp^2d

) Choose the correct answer from the options given below :

(A)A, B and C only
(B)A and B only
(C)A, B, C and D
(D)B, C and D Only

Q20·ChemistrySingle correctJEE Main 2026

One mole of

\text{Cl}_{2}

(g) was passed into 2 L of cold 2M KOH solution. After the reaction, the concentrations of

\text{Cl}^{-}

,

\text{ClO}^{-}

and

\text{OH}^{-}

are respectively (assume volume remains constant)

(A)0.75 M , 0.75 M , 1 M
(B)0.5 M , 0.5 M , 0.5 M
(C)0.5 M , 0.5 M , 1 M
(D)1 M , 1M , 1 M

Q21·ChemistrySingle correctJEE Main 2026

Choose the INCORRECT statement

(A)Among the isotopes of carbon, $^{13}\text{C}$ is a radioactive isotope.
(B)Carbon exhibits negative oxidation states along with +4 and +2.
(C)Carbon cannot exceed its covalency more than four.
(D) $\text{CO}_{2}$ is the most acidic oxide among the dioxides of group of 14 elements.

Q22·ChemistrySingle correctJEE Main 2026

Which statements are NOT TRUE about XeO

_{2}

F

_{2}

? A. It has a see-saw shape. B. Xe has 5 electron pairs in its valence shell in XeO

_{2}

F

_{2}

. C. The O–Xe–O bond angle is close to 180°. D. The F–Xe–F bond angle is close to 180° E. Xe has 16 valence electrons in XeO

_{2}

F

_{2}

. Choose the correct answer from the options given below.

(A)B, C and E only
(B)B and D only
(C)A and D only
(D)B, D and E only

Q23·ChemistrySingle correctJEE Main 2026

Elements X and Y belong to Group 15. The difference between the electronegativity values of ‘X’ and phosphorus is higher than that of the difference between phosphorus and ‘Y’. ‘X’ & ‘Y’ are respectively

(A)N & As
(B)As & Bi
(C)Bi & N
(D)As & Sb

Q24·ChemistrySingle correctJEE Main 2026

The correct statements from the following are : (A) Ionic radii of trivalent cations of group 13 elements decreases down the group. (B) Electronegativity of group 13 elements decreases down the group. (C) Among the group 13 elements, Boron has highest first ionisation enthalpy. (D) The trichloride and triiodide of group 13 elements are covalent in nature. Choose the correct answer from the otpions given below :

(A)A and C only
(B)A and D only
(C)C and D only
(D)B and D only

Q25·ChemistrySingle correctJEE Main 2026

Given below are two statements : Statement-I : Element 'X' and 'Y' are the most and least electronegative elements, respectively among N, As, Sb and P. The nature of the oxides

X_2O_3

and

Y_2O_3

is acidic and amphoteric, respectively. Statement-II :

BCl_3

is covalent in nature and gets hydrolysed in water. It produces

[B(OH)_4]^-

and

[B(H_2O)_6]^{3+}

in aqueous medium. In the light of the above statements, choose the correct answer from the options given below :

(A)Both Statement-I and Statement-II are true.
(B)Statement-I is true but Statement-II is false.
(C)Both Statement-I and Statement-II are false.
(D)Statement-I is false but Statement-II is true.

Q26·ChemistrySingle correctJEE Main 2026

Given below are two statements : Statement I : The halogen that makes longest bond with hydrogen in HX, has the smallest covalent radius in its group. Statement II : A group 15 element's hydride EH

_3

has the lowest boiling point among corresponding hydrides of other group 15 elements. The maximum covalency of that element E is 4. In the light of the above statements, choose the correct answer from the options given below.

(A)Both Statement I and Statement II are true.
(B)Statement I is false but Statement II is true.
(C)Both Statement I and Statement II are false.
(D)Statement I is true but Statement II is false.

Q27·ChemistrySingle correctJEE Main 2026

Given below are two statements : Statement I : The correct order in terms of bond dissociation enthalpy is

\text{Cl}_{2} > \text{Br}_{2} > \text{F}_{2} > \text{I}_{2}

Statement II : The correct trend in the covalent character of the metal halides is

[\text{SnCl}_{4} > \text{SnCl}_{2}]

,

[\text{PbCl}_{4} > \text{PbCl}_{2}]

and

[\text{UF}_{4} > \text{UF}_{6}]

In the light of the above statements, choose the correct answer from the options given below :

(A)Statement I is true but Statement II is false
(B)Both Statement I and Statement II are true
(C)Statement I is false but Statement II is true
(D)Both Statement I and Statement II are false

Q28·ChemistrySingle correctJEE Main 2026

Given below are two statements : Statement I : The number of pairs among

[SiO_2, CO_2]

,

[SnO, SnO_2]

,

[PbO, PbO_2]

and

[GeO, GeO_2]

, which contain oxides that are both amphoteric is 2. Statement II :

BF_3

is an electron deficient molecule can act as a lewis acid, forms adduct with

NH_3

and has a trigonal planar geometry. In the light of the above statement, choose the correct answer from the option given below.

(A)Both Statement I and Statement II are true.
(B)Both Statement I and Statement II are false.
(C)Statement I is true but Statement II is false.
(D)Statement I is false Statement II is true.

Q29·ChemistrySingle correctJEE Main 2026

Consider the following reactions.

PbCl_2 + K_2CrO_4 \rightarrow A + 2KCl

(Hot solution)

A + NaOH \rightleftharpoons B + Na_2CrO_4

PbSO_4 + 4CH_3COONH_4 \rightarrow (NH_4)_2SO_4 + X

In the above reactions, A, B and X are respectively.

(A) $Na_2[Pb(OH)_2], PbCrO_4$ and $(NH_4)_2[Pb(CH_3COO)_4]$
(B) $PbCrO_4$ , $Na_2[Pb(OH)_4]$ and $[Pb(NH_3)_4]SO_4$
(C) $Na_2[Pb(OH)_2]$ , $PbCrO_4$ and $[Pb(NH_3)_4]SO_4$
(D) $PbCrO_4$ , $Na_2[Pb(OH)_4]$ and $(NH_4)_2[Pb(CH_3COO)_4]$

Q30·ChemistrySingle correctJEE Advanced 2025

The heating of

NH_4NO_2

at 60–70°C and

NH_4NO_3

at 200–250°C is associated with the formation of nitrogen containing compounds X and Y, respectively. X and Y, respectively, are

(A) $N_2$ and $N_2O$
(B) $NH_3$ and $NO_2$
(C) $NO$ and $N_2O$
(D) $N_2$ and $NH_3$

Q31·ChemistryMultiple correctJEE Advanced 2025

The compound(s) with P

-

H bond(s) is(are)

(A)H $_{3}$ PO $_{4}$
(B)H $_{3}$ PO $_{3}$
(C)H $_{4}$ P $_{2}$ O $_{7}$
(D)H $_{3}$ PO $_{2}$

Q32·ChemistrySingle correctJEE Advanced 2025

The complete hydrolysis of ICl, ClF

_{3}

and BrF

_{5}

, respectively, gives

(A)IO $^{-}$ , ClO $_{2}^{-}$ and BrO $_{3}^{-}$
(B)IO $_{3}^{-}$ , ClO $_{2}^{-}$ and BrO $_{3}^{-}$
(C)IO $^{-}$ , ClO $^{-}$ and BrO $_{2}^{-}$
(D)IO $_{3}^{-}$ , ClO $_{4}^{-}$ and BrO $_{2}^{-}$

Q33·ChemistrySingle correctJEE Main 2025

Given below are two statements: Statement I:

H_2Se

is more acidic than

H_2Te

. Statement II:

H_2Se

has higher bond enthalpy for dissociation than

H_2Te

. In the light of the above statements, choose the correct answer from the options given below:

(A)Both Statement I and Statement II are false.
(B)Both statement I and Statement II are true.
(C)Statement I is true but Statement II is false.
(D)Statement I is false but Statement II is true.

Q34·ChemistrySingle correctJEE Main 2025

The correct statements from the following are: (A)

Tl^{3+}

is a powerful oxidising agent (B)

Al^{3+}

does not get reduced easily (C) Both

Al^{3+}

and

Tl^{3+}

are very stable in solution (D)

Tl^+

is more stable than

Tl^{3+}

(E)

Al^{3+}

and

Tl^+

are highly stable Choose the correct answer from the options given below:

(A)(A), (B), (C), (D) and (E)
(B)(A), (B), (D) and (E) only
(C)(B), (D) and (E) only
(D)(A), (C) and (D) only

Q35·ChemistrySingle correctJEE Main 2025

The group 14 elements A and B have the first ionisation enthalpy values of 708 and 715 kJ mol

^{-1}

respectively. The above values are lowest among their group members. The nature of their ions

A^{2+}

,

B^{4+}

respectively is

(A)both reducing
(B)both oxidising
(C)reducing and oxidising
(D)oxidising and reducing

Q36·ChemistrySingle correctJEE Main 2025

The elements of Group 13 with highest and lowest first ionisation enthalpies are respectively:

(A)B & Ga
(B)B & Tl
(C)Tl & B
(D)B & In

Q37·ChemistrySingle correctJEE Main 2025

Given below are two statements: Statement (I): The first ionisation enthalpy of group 14 elements is higher than the corresponding elements of group 13. Statement (II): Melting points and boiling points of group 13 elements are in general much higher than the corresponding elements of group 14. In the light of the above statements, choose the most appropriate answer from the options given below:

(A)Statement I is correct but Statement II is incorrect
(B)Statement I is incorrect but Statement II is correct
(C)Both Statement I and Statement II are incorrect
(D)Both Statement I and Statement II are correct

Q38·ChemistrySingle correctJEE Main 2025

Given below are two statements: Statement I: Nitrogen forms oxides with

+1

to

+5

oxidation states due to the formation of

p\pi-p\pi

bond with oxygen. Statement II: Nitrogen does not form halides with

+5

oxidation state due to the absence of d-orbital in it. In the light of given statements, choose the correct answer from the options below:

(A)Statement I is true but Statement II is false
(B)Both Statement I and Statement II are false
(C)Statement I is false but Statement II is true
(D)Both Statement I and Statement II are true

Q39·ChemistrySingle correctJEE Main 2025

Given below are the pairs of group 13 elements showing their relation in terms of atomic radius.

(B<Al)

,

(Al<Ga)

,

(Ga<In)

and

(In<Tl)

. Identify the elements present in the incorrect pair and in that pair find out the element (X) that has higher ionic radius (

M^{3+}

) than the other one. The atomic number of the element (X) is

(A)31
(B)49
(C)13
(D)81

Q40·ChemistrySingle correctJEE Main 2025

The correct orders among the following are: A. Atomic radius:

B < Al < Ga < In < Tl

B. Electronegativity:

Al < Ga < In < Tl < B

C. Density:

Tl < In < Ga < Al < B

D. 1st Ionisation Energy:

In < Al < Ga < Tl < B

Choose the correct answer from the options given below:

(A)B and D Only
(B)A and C Only
(C)C and D Only
(D)A and B Only

Q41·ChemistrySingle correctJEE Main 2025

Given below are two statements. Statement I: The N-N single bond is weaker and longer than that of P-P single bond. Statement II: Compounds of group 15 elements in +3 oxidation states readily undergo disproportionation reactions. In the light of above statements, choose the correct answer from the options given below:

(A)Statement I is true but statement II is false
(B)Both statement I and statement II are false
(C)Statement I is false but Statement II is true
(D)Both statement I and Statement II are true

Q42·ChemistrySingle correctJEE Main 2025

The nature of oxide

(TeO_2)

and hydride

(TeH_2)

formed by Te, respectively are:

(A)Oxidising and acidic
(B)Reducing and basic
(C)Reducing and acidic
(D)Oxidising and basic

Q43·ChemistrySingle correctJEE Main 2025

Given below are two statements: Statement (I): The metallic radius of Al is less than that of Ga. Statement (II): The ionic radius of

Al^{3+}

is less than that of

Ga^{3+}

. In the light of the above statements, choose the most appropriate answer from the options given below:

(A)Both Statement I and Statement II are incorrect
(B)Statement I is incorrect but Statement II is correct
(C)Statement I is correct but Statement II is incorrect
(D)Both Statement I and Statement II are correct

Q44·ChemistrySingle correctJEE Main 2025

The property/properties that show irregularity in the first four elements of group-17 is/are: (A) Covalent radius (B) Electron affinity (C) Ionic radius (D) First ionization energy. Choose the correct answer from the options given below:

(A)B and D only
(B)A and C only
(C)B only
(D)A, B, C and D

Q45·ChemistrySingle correctJEE Main 2025

A molecule with the formula

AX_4Y

has all its elements from the p-block. Element A is rarest, monoatomic, non-radioactive and has the lowest ionization enthalpy value among A, X and Y. Elements X and Y have first and second highest electronegativity values respectively among all the known elements. The shape of the molecule is:

(A)Square pyramidal
(B)Octahedral
(C)Pentagonal planar
(D)Trigonal bipyramidal

Q46·ChemistrySingle correctJEE Main 2025

The standard reduction potential values of some of the p-block ions are given below. Predict the one with the strongest oxidising capacity.

(A) $E^\circ_{Sn^{4+}/Sn^{2+}}=+1.15$ V
(B) $E^\circ_{Tl^{3+}/Tl^{+}}=+1.26$ V
(C) $E^\circ_{Al^{3+}/Al}=-1.66$ V
(D) $E^\circ_{Pb^{4+}/Pb^{2+}}=+1.67$ V

Q47·ChemistrySingle correctJEE Main 2025

First ionisation enthalpy values of first four group 15 elements are given below. Choose the correct value for the element that is a main component of apatite family:

(A)1012 kJ mol⁻¹
(B)1402 kJ mol⁻¹
(C)834 kJ mol⁻¹
(D)947 kJ mol⁻¹

Q48·ChemistryIntegerJEE Main 2025

A group 15 element forms d

\pi

-d

\pi

bond with transition metals. It also forms hydride, which is a strongest base among the hydrides of other group members that form d

\pi

-d

\pi

bond. The atomic number of this element is ______.

Q49·ChemistrySingle correctJEE Main 2025

The large difference between the melting and boiling points of oxygen and sulphur may be explained on the basis of

(A)Atomic size
(B)Atomicity
(C)Electronegativity
(D)Electron gain enthalpy

Q50·ChemistrySingle correctJEE Main 2025

The incorrect statement among the following is

(A)PH₃ shows lower proton affinity than NH₃.
(B)PF₃ exists but NF₅ does not.
(C)NO₂ can dimerise easily.
(D)SO₂ can act as an oxidizing agent, but not as a reducing agent.

Q51·ChemistrySingle correctJEE Main 2025

Given below are the atomic numbers of some group 14 elements. The atomic number of the element with lowest melting point is :

(A)14
(B)6
(C)82
(D)50

Q52·ChemistrySingle correctJEE Main 2025

The species which does not undergo disproportionation reaction is:

(A) $ClO_2^-$
(B) $ClO_4^-$
(C) $ClO^-$
(D) $ClO_3^-$

Q53·ChemistrySingle correctJEE Main 2025

The maximum covalency of a non-metallic group 15 element 'E' with weakest E

-

E bond is:

(A)5
(B)3
(C)6
(D)4

Q54·ChemistrySingle correctJEE Advanced 2024

The species formed on fluorination of phosphorus pentachloride in a polar organic solvent are

(A) $[PF_4]^+[PF_6]^-$ and $[PCl_4]^+[PF_6]^-$
(B) $[PCl_4]^+[PCl_4F_2]^-$ and $[PCl_4]^+[PF_6]^-$
(C) $PF_3$ and $PCl_3$
(D) $PF_5$ and $PCl_3$

Q55·ChemistryMultiple correctJEE Advanced 2024

The compound(s) having peroxide linkage is(are)

(A) $H_2S_2O_7$
(B) $H_2S_2O_8$
(C) $H_2S_2O_5$
(D) $H_2SO_5$

Q56·ChemistrySingle correctJEE Advanced 2024

At room temperature, disproportionation of an aqueous solution of

\textit{in situ}

generated nitrous acid (HNO

_{2}

) gives the species

(A)H $_{3}$ O $^{+}$ , NO $_{3}^{-}$ and NO
(B)H $_{3}$ O $^{+}$ , NO $_{3}^{-}$ and NO $_{2}$
(C)H $_{3}$ O $^{+}$ , NO $^{-}$ and NO $_{2}$
(D)H $_{3}$ O $^{+}$ , NO $_{3}^{-}$ and N $_{2}$ O

Q57·ChemistrySingle correctJEE Main 2024

Given below are two statements : one is labelled as Assertion (A) : and the other is labelled as Reason (R). Assertion (A) : Both rhombic and monoclinic sulphur exist as

S_8

while oxygen exists as

O_2

. Reason (R) : Oxygen forms

p\pi

-

p\pi

multiple bonds with itself and other elements having small size and high electronegativity like C, N, which is not possible for sulphur. In the light of the above statements, choose the most appropriate answer from the options given below :

(A)Both (A) and (R) are correct and (R) is the correct explanation of (A).
(B)Both (A) and (R) are correct but (R) is not the correct explanation of (A).
(C)(A) is correct but (R) is not correct.
(D)(A) is not correct but (R) is correct.

Q58·ChemistrySingle correctJEE Main 2024

The

F^-

ions make the enamel on teeth much harder by converting hydroxyapatite (the enamel on the surface of teeth) into much harder fluoroapatite having the formula.

(A) $[3(Ca_3(PO_4)_2).CaF_2]$
(B) $[3(Ca_2(PO_4)_2).Ca(OH)_2]$
(C) $[3(Ca_3(PO_4)_3).CaF_2]$
(D) $[3(Ca_3(PO_4)_2).Ca(OH)_2]$

Q59·ChemistryNumericalJEE Main 2024

Number of oxygen atoms present in the chemical formula of fuming sulphuric acid is _______.

Q60·ChemistrySingle correctJEE Main 2024

On reaction of Lead Sulphide with dilute nitric acid which of the following is

not

formed?

(A)Lead nitrate
(B)Sulphur
(C)Nitric oxide
(D)Nitrous oxide

Q61·ChemistrySingle correctJEE Main 2024

Identify the incorrect statements about group 15 elements: (A) Dinitrogen is a diatomic gas which acts like an inert gas at room temperature. (B) The common oxidation states of these elements are

-3

,

+3

and

+5

. (C) Nitrogen has unique ability to form

p\pi-p\pi

multiple bonds. (D) The stability of

+5

oxidation states increases down the group. (E) Nitrogen shows a maximum covalency of 6. Choose the correct answer from the options given below.

(A)(A), (B), (D) only
(B)(A), (C), (E) only
(C)(B), (D), (E) only
(D)(D) and (E) only

Q62·ChemistrySingle correctJEE Main 2024

Among the following halogens

F_2

,

Cl_2

,

Br_2

and

I_2

, which can undergo disproportionation reaction?

(A)Only $I_2$
(B) $Cl_2$ , $Br_2$ and $I_2$
(C) $F_2$ , $Cl_2$ and $Br_2$
(D) $F_2$ and $Cl_2$

Q63·ChemistrySingle correctJEE Main 2024

Identify the correct statements about p-block elements and their compounds. (A) Non metals have higher electronegativity than metals. (B) Non metals have lower ionisation enthalpy than metals. (C) Compounds formed between highly reactive nonmetals and highly reactive metals are generally ionic. (D) The non-metal oxides are generally basic in nature. (E) The metal oxides are generally acidic or neutral in nature.

(A)(D) and (E) only
(B)(A) and (C) only
(C)(B) and (E) only
(D)(B) and (D) only

Q64·ChemistrySingle correctJEE Main 2024

Given below are two statements: Assertion A: The stability order of

+1

oxidation state of Ga, In and Tl is Ga < In < Tl. Reason R: The inert pair effect stabilizes the lower oxidation state down the group. In the light of the above statements, choose the correct answer from the options given below:

(A)Both A and R are true and R is the correct explanation of A.
(B)A is true but R is false.
(C)Both A and R are true but R is NOT the correct explanation of A.
(D)A is false but R is true.

Q65·ChemistrySingle correctJEE Main 2024

The number of ions from the following that are expected to behave as oxidising agent is:

Sn^{4+}

,

Sn^{2+}

,

Pb^{2+}

,

Tl^{3+}

,

Pb^{4+}

,

Tl^+

(A)3
(B)4
(C)1
(D)2

Q66·ChemistrySingle correctJEE Main 2024

Evaluate the following statements related to group 14 elements for their correctness. (A) Covalent radius decreases down the group from C to Pb in a regular manner. (B) Electronegativity decreases from C to Pb down the group gradually. (C) Maximum covalence of C is 4 whereas other elements can expand their covalence due to presence of d orbitals. (D) Heavier elements do not form

p\pi-p\pi

bonds. (E) Carbon can exhibit negative oxidation states. Choose the correct answer from the options given below:

(A)(C), (D) and (E) Only
(B)(A) and (B) Only
(C)(A), (B) and (C) Only
(D)(C) and (D) Only

Q67·ChemistrySingle correctJEE Main 2024

Given below are two statements: Statement I: Gallium is used in the manufacturing of thermometers. Statement II: A thermometer containing gallium is useful for measuring the freezing point (256 K) of brine solution. In the light of the above statements, choose the correct answer from the options given below:

(A)Both Statement I and Statement II are false.
(B)Statement I is false but Statement II is true.
(C)Both Statement I and Statement II are true.
(D)Statement I is true but Statement II is false.

Q68·ChemistrySingle correctJEE Main 2024

The correct statements from the following are: (A) The decreasing order of atomic radii of group 13 elements is Tl > In > Ga > Al > B. (B) Down group 13, electronegativity decreases from top to bottom. (C) Al dissolves in dil. HCl and liberates

\text{H}_2

, but conc.

\text{HNO}_3

renders Al passive by forming a protective oxide layer on the surface. (D) All elements of group 13 exhibit a highly stable +1 oxidation state. (E) The hybridisation of Al in

[\text{Al}(\text{H}_2\text{O})_6]^{3+}

ion is

sp^3d^2

. Choose the correct answer from the options given below:

(A)(C) and (E) only
(B)(A), (C) and (E) only
(C)(A), (B), (C) and (E) only
(D)(A) and (C) only

Q69·ChemistrySingle correctJEE Main 2024

The number of neutrons present in the more abundant isotope of boron is 'x'. Amorphous boron upon heating with air forms a product in which the oxidation state of boron is 'y'. The value of

x + y

is:

(A)4
(B)6
(C)3
(D)9

Q70·ChemistrySingle correctJEE Main 2024

Given below are two statements: Statement I: In group 13, the stability of the +1 oxidation state increases down the group. Statement II: The atomic size of gallium is greater than that of aluminium. In the light of the above statements, choose the most appropriate answer from the options given below:

(A)Statement I is incorrect but Statement II is correct
(B)Both Statement I and Statement II are correct
(C)Both Statement I and Statement II are incorrect
(D)Statement I is correct but Statement II is incorrect

Q71·ChemistrySingle correctJEE Main 2024

When

\text{MnO}_2

and

\text{H}_2\text{SO}_4

is added to a salt (A), greenish yellow gas liberated as salt (A) is

(A) $\text{NaBr}$
(B) $\text{CaI}_2$
(C) $\text{KNO}_3$
(D) $\text{NH}_4\text{Cl}$

Q72·ChemistryNumericalJEE Main 2024

Among the following oxides of p-block elements, number of oxides having amphoteric nature is ___.

Cl_2O_7

,

CO

,

PbO_2

,

N_2O

,

NO

,

Al_2O_3

,

SiO_2

,

SnO_2

Q73·ChemistrySingle correctJEE Main 2024

The strongest reducing agent among the following is:

(A) $\text{NH}_3$
(B) $\text{SbH}_3$
(C) $\text{BiH}_3$
(D) $\text{PH}_3$

Q74·ChemistrySingle correctJEE Main 2024

Given below are two statements: Assertion (A):

PH_3

has lower boiling point than

NH_3

. Reason (R): In liquid state

NH_3

molecules are associated through vander waal's forces, but

PH_3

molecules are associated through hydrogen bonding. In the light of the above statements, choose the most appropriate answer from the options given below:

(A)Both (A) and (R) are correct and (R) is the correct explanation of (A)
(B)(A) is not correct but (R) is correct
(C)Both (A) and (R) are correct but (R) is not the correct explanation of (A)
(D)(A) is correct but (R) is not correct

Q75·ChemistrySingle correctJEE Main 2024

Given below are two statements: Statement (I):

\text{SiO}_2

and

\text{GeO}_2

are acidic while SnO and PbO are amphoteric in nature. Statement (II): Allotropic forms of carbon are due to property of catenation and p

\pi

–d

\pi

bond formation. In the light of the above statements, choose the most appropriate answer from the options given below:

(A)Both Statement I and Statement II are false
(B)Both Statement I and Statement II are true
(C)Statement I is true but Statement II is false
(D)Statement I is false but Statement II is true

Q76·ChemistrySingle correctJEE Main 2024

Given below are two statements: Statement-I : Noble gases have very high boiling points. Statement-II : Noble gases are monoatomic gases. They are held together by strong dispersion forces. Because of this they are liquefied at very low temperature. Hence, they have very high boiling points. In the light of the above statements, choose the correct answer from the options given below:

(A)Statement I is false but Statement II is true.
(B)Both Statement I and Statement II are true.
(C)Statement I is true but Statement II is false.
(D)Both Statement I and Statement II are false.

Q77·ChemistryNumericalJEE Main 2024

Molar mass of the salt from NaBr,

NaNO_3

, KI and

CaF_2

which does not evolve coloured vapours on heating with concentrated

H_2SO_4

is ______ g mol

^{-1}

. (Molar mass in g mol

^{-1}

: Na : 23, N : 14, K : 39, O : 16, Br : 80, I : 127, F : 19, Ca : 40)

Q78·ChemistrySingle correctJEE Main 2024

Consider the oxides of group 14 elements

SiO_2

,

GeO_2

,

SnO_2

,

PbO_2

, CO and GeO. The amphoteric oxides are

(A) $GeO, GeO_2$
(B) $SiO_2, GeO_2$
(C) $SnO_2, PbO_2$
(D) $SnO_2, CO$

Q79·ChemistrySingle correctJEE Main 2024

Given below are two statements: Statement-I: Group 13 trivalent halides easily get hydrolyzed by water due to their covalent nature. Statement-II:

AlCl_3

upon hydrolysis in acidified aqueous solution forms octahedral

[Al(H_2O)_6]^{3+}

ion. In the light of the above statements, choose the correct answer from the options given below:

(A)Statement I is true but Statement II is false
(B)Statement I is false but Statement II is true
(C)Both statement I and statement II are false
(D)Both statement I and statement II are true

Q80·ChemistrySingle correctJEE Main 2024

Choose the correct statements from the following A. All group 16 elements form oxides of general formula

EO_2

and

EO_3

where E = S, Se, Te and Po. Both the types of oxides are acidic in nature. B.

TeO_2

is an oxidising agent while

SO_2

is reducing in nature. C. The reducing property decreases from

H_2S

to

H_2Te

down the group. D. The ozone molecule contains five lone pairs of electrons. Choose the correct answer from the options given below:

(A)A and D only
(B)B and C only
(C)C and D only
(D)A and B only

Q81·ChemistrySingle correctJEE Main 2024

Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R. Assertion A:

H_2Te

is more acidic than

H_2S

. Reason R: Bond dissociation enthalpy of

H_2Te

is lower than

H_2S

. In the light of the above statements, choose the most appropriate answer from the options given below:

(A)Both A and R are true but R is NOT the correct explanation of A.
(B)Both A and R are true and R is the correct explanation of A.
(C)A is false but R is true.
(D)A is true but R is false.

Q82·ChemistrySingle correctJEE Main 2024

Choose the correct statements about the hydrides of group 15 elements. A. The stability of the hydrides decreases in the order

NH_3 > PH_3 > AsH_3 > SbH_3 > BiH_3

. B. The reducing ability of the hydrides increases in the order

NH_3 < PH_3 < AsH_3 < SbH_3 < BiH_3

. C. Among the hydrides,

NH_3

is strong reducing agent while

BiH_3

is mild reducing agent. D. The basicity of the hydrides increases in the order

NH_3 < PH_3 < AsH_3 < SbH_3 < BiH_3

. Choose the most appropriate answer from the option given below:

(A)B and C only
(B)C and D only
(C)A and B only
(D)A and D only

Q83·ChemistrySingle correctJEE Main 2024

On passing a gas 'X' through Nessler's reagent, a brown precipitate is obtained. The gas 'X' is:

(A) $H_2S$
(B) $CO_2$
(C) $NH_3$
(D) $Cl_2$

Q84·ChemistrySingle correctJEE Main 2024

Given below are two statements : Statement I : The electronegativity of group 14 elements from Si to Pb gradually decreases. Statement II : Group 14 contains non-metallic, metallic, as well as metalloid elements. In the light of the above statements, choose the most appropriate from the options given below :

(A)Statement I is false but Statement II is true
(B)Statement I is true but Statement II is false
(C)Both Statement I and Statement II are true
(D)Both Statement I and Statement II are false

Q85·ChemistryNumericalJEE Main 2024

The oxidation number of iron in the compound formed during brown ring test for

NO_3^-

ion is ___.

Q86·ChemistrySingle correctJEE Main 2024

Anomalous behaviour of oxygen is due to its:

(A)Large size and high electronegativity
(B)Small size and low electronegativity
(C)Small size and high electronegativity
(D)Large size and low electronegativity

Q87·ChemistrySingle correctJEE Main 2024

Which of the following cannot function as an oxidising agent ?

(A) $N^{3-}$
(B) $SO_4^{2-}$
(C) $BrO_3^-$
(D) $MnO_4^-$

Q88·ChemistrySingle correctJEE Main 2024

Element not showing variable oxidation state is:

(A)Bromine
(B)Iodine
(C)Chlorine
(D)Fluorine

Q89·ChemistryNumericalJEE Main 2024

From the given list, the number of compounds with +4 oxidation state of Sulphur __________:

\text{SO}_3,\;\text{H}_2\text{SO}_3,\;\text{SOCl}_2,\;\text{SF}_4,\;\text{BaSO}_4,\;\text{H}_2\text{S}_2\text{O}_7

.

Q90·ChemistrySingle correctJEE Main 2024

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Melting point of Boron (2453 K) is unusually high in group 13 elements. Reason (R): Solid Boron has very strong crystalline lattice. In the light of the above statements, choose the most appropriate answer from the options given below:

(A)Both (A) and (R) are correct but (R) is Not the correct explanation of (A)
(B)Both (A) and (R) are correct and (R) is the correct explanation of (A)
(C)(A) is true but (R) is false
(D)(A) is false but (R) is true

Q91·ChemistrySingle correctJEE Main 2024

Yellow compound of lead chromate gets dissolved on treatment with hot NaOH solution. The product of lead formed is a:

(A)Tetraanionic complex with coordination number six
(B)Neutral complex with coordination number four
(C)Dianionic complex with coordination number six
(D)Dianionic complex with coordination number four

Q92·ChemistrySingle correctJEE Main 2024

Given below are two statements : Statement (I) : Oxygen being the first member of group 16 exhibits only

-2

oxidation state. Statement (II) : Down the group 16 stability of

+4

oxidation state decreases and

+6

oxidation state increases. In the light of the above statements, choose the most appropriate answer from the options given below :

(A)Statement I is correct but Statement II is incorrect
(B)Both Statement I and Statement II are incorrect
(C)Both Statement I and Statement II are correct
(D)Statement I is incorrect but Statement II is correct

Q93·ChemistryNumericalJEE Advanced 2023

The stoichiometric reaction of 516 g of dimethyldichlorosilane with water results in a tetrameric cyclic product X in 75% yield. The weight (in g) of X obtained is___. [Use, molar mass (

\mathrm{g\ mol^{-1}}

): H = 1, C = 12, O = 16, Si = 28, Cl = 35.5]

Q94·ChemistrySingle correctJEE Advanced 2023

Match the reactions (in the given stoichiometry of the reactants) in List-I with one of their products given in List-II and choose the correct option.

List-I	List-II
P. $\mathrm{P_2O_3 + 3H_2O} \rightarrow$	1. $\mathrm{P(O)(OCH_3)Cl_2}$
Q. $\mathrm{P_4 + 3NaOH + 3H_2O} \rightarrow$	2. $\mathrm{H_3PO_3}$
R. $\mathrm{PCl_5 + CH_3COOH} \rightarrow$	3. $\mathrm{PH_3}$
S. $\mathrm{H_3PO_2 + 2H_2O + 4AgNO_3} \rightarrow$	4. $\mathrm{POCl_3}$
	5. $\mathrm{H_3PO_4}$

(A)P $\rightarrow$ 2; Q $\rightarrow$ 3; R $\rightarrow$ 1; S $\rightarrow$ 5
(B)P $\rightarrow$ 3; Q $\rightarrow$ 5; R $\rightarrow$ 4; S $\rightarrow$ 2
(C)P $\rightarrow$ 5; Q $\rightarrow$ 2; R $\rightarrow$ 1; S $\rightarrow$ 3
(D)P $\rightarrow$ 2; Q $\rightarrow$ 3; R $\rightarrow$ 4; S $\rightarrow$ 5

Q95·ChemistrySingle correctJEE Main 2023

The number of P-O-P bonds in

H_4P_2O_7

,

(HPO_3)_3

and

P_4O_{10}

are respectively.

(A)1, 3, 6
(B)0, 3, 6
(C)0, 3, 4
(D)1, 2, 4

Q96·ChemistrySingle correctJEE Main 2023

The covalency and oxidation state respectively of boron in

[BF_4]^-

are

(A)4 and 3
(B)4 and 4
(C)3 and 4
(D)3 and 5

Q97·ChemistrySingle correctJEE Main 2023

The correct group of halide ions which can be oxidised by oxygen in acidic medium is

(A) $Br^-$ only
(B) $Cl^-, Br^-$ and $I^-$ only
(C) $Br^-$ and $I^-$ only
(D) $I^-$ only

Q98·ChemistrySingle correctJEE Main 2023

The incorrect statement from the following for borazine is:

(A)It has electronic delocalization
(B)It contains banana bonds
(C)It can react with water
(D)It is a cyclic compound

Q99·ChemistryNumericalJEE Main 2023

If the formula of Borax is

Na_2B_4O_x(OH)_y \cdot zH_2O

, then

x + y + z =

____.

Q100·ChemistrySingle correctJEE Main 2023

Given below are two statements: Statement I: Boron is extremely hard indicating its high lattice energy. Statement II: Boron has highest melting and boiling point compared to its other group members. In the light of the above statements, choose the most appropriate answer from the options given below:

(A)Statement I is incorrect but Statement II is correct
(B)Both Statement I and Statement II are correct
(C)Statement I is correct but Statement II is incorrect
(D)Both Statement I and Statement II are incorrect

Q101·ChemistrySingle correctJEE Main 2023

Given below are two statements: Statement I: SbCl

_5

is more covalent than SbCl

_3

. Statement II: The higher oxides of halogens also tend to be more stable than the lower ones. In the light of the above statements, choose the most appropriate answer from the options given below:

(A)Both Statement I and Statement II are correct
(B)Both Statement I and Statement II are incorrect
(C)Statement I is correct but Statement II is incorrect
(D)Statement I is incorrect but Statement II is correct

Q102·ChemistrySingle correctJEE Main 2023

For compound having the formula

GaAlCl_4

, the correct option from the following is

(A)Ga is more electronegative than Al and is present as a cationic part of the salt $GaAlCl_4$
(B)Oxidation state of Ga in the salt $GaAlCl_4$ is +3.
(C)Cl forms bond with both Al and Ga in $GaAlCl_4$
(D)Ga is coordinated with Cl in $GaAlCl_4$

Q103·ChemistrySingle correctJEE Main 2023

One mole of

P_4

reacts with 8 moles of

SOCl_2

to give 4 moles of A, x moles of

SO_2

and 2 moles of B. A, B and x respectively are

(A) $PCl_3,\ S_2Cl_2$ and 4
(B) $POCl_3,\ S_2Cl_2$ and 4
(C) $PCl_3,\ S_2Cl_2$ and 2
(D) $POCl_3,\ S_2Cl_2$ and 2

Q104·ChemistrySingle correctJEE Main 2023

For elements B, C, N, Li, Be, O and F the correct order of first ionization enthalpy is

(A)Li < Be < B < C < N < O < F
(B)B > Li > Be > C > N > O > F
(C)Li < B < Be < C < O < N < F
(D)Li < Be < B < C < O < N < F

Q105·ChemistrySingle correctJEE Main 2023

The compound which does not exist is

(A)NaO $_2$
(B)(NH $_4$ ) $_2$ BeF $_4$
(C)BeH $_2$
(D)PbI $_4$

Q106·ChemistryNumericalJEE Main 2023

In the following reactions, the total number of oxygen atoms in X and Y is _________.

Na_2O+H_2O\rightarrow2X

;

Cl_2O_7+H_2O\rightarrow2Y

Q107·ChemistryNumericalJEE Main 2023

In the complete hydrolysis of

\text{XeF}_4

, the difference in the oxidation state of Xe between the oxidised product of

\text{XeF}_4

and

\text{XeF}_4

is _______ .

Q108·ChemistryNumericalJEE Main 2023

The sum of lone pairs present on the central atom of the interhalogen IF

_5

and IF

_7

is _________.

Q109·ChemistrySingle correctJEE Main 2023

The correct order of electronegativity for given elements is:

(A)C > P > At > Br
(B)Br > P > At > C
(C)P > Br > C > At
(D)Br > C > At > P

Q110·ChemistrySingle correctJEE Main 2023

Which halogen is known to cause the reaction given below:

2Cu^{2+} + 4X^- \rightarrow Cu_2X_2(s) + X_2

(A)Only Iodine
(B)Only Bromine
(C)All halogens
(D)Only Chlorine

Q111·ChemistryNumericalJEE Main 2023

XeF_4

reacts with

SbF_5

to form

[XeF_m]^{n+}[SbF_y]^{z-}

.

m + n + y + z =

____

Q112·ChemistrySingle correctJEE Main 2023

Which one of the following elements will remain as liquid inside pure boiling water?

(A)Cs
(B)Ga
(C)Li
(D)Br

Q113·ChemistrySingle correctJEE Main 2023

Group-13 elements react with

O_2

in amorphous form to form oxides of type

M_2O_3

(

M

= element). Which among the following is the most basic oxide?

(A) $Al_2O_3$
(B) $Ga_2O_3$
(C) $Tl_2O_3$
(D) $B_2O_3$

Q114·ChemistryAssertion & ReasonJEE Main 2023

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Amongst He, Ne, Ar and Kr; 1 g of activated charcoal adsorbs more of Kr. Reason R: The critical volume

V_c

(

\text{cm}^3\,\text{mol}^{-1}

) and critical pressure

P_c

(atm) is highest for Krypton but the compressibility factor at critical point

Z_c

is lowest for Krypton. In the light of the above statements, choose the correct answer from the options given below:

(A)A is true but R is false
(B)Both A and R are true and R is the correct explanation of A
(C)A is false but R is true
(D)Both A and R are true but R is NOT the correct explanation of A

Q115·ChemistrySingle correctJEE Main 2023

Given below are two statements: Statement I: Chlorine can easily combine with oxygen to form oxides; and the product has a tendency to explode. Statement II: Chemical reactivity of an element can be determined by its reaction with oxygen and halogens. In the light of the above statements, choose the correct answer from the options given below:

(A)Both the Statements I and II are true
(B)Both the Statements I and II are false
(C)Statement I is false but Statement II is true
(D)Statement I is true but Statement II is false

Q116·ChemistrySingle correctJEE Main 2023

O-O

bond length in

H_2O_2

is

\underline{X}

than the

O-O

bond length in

F_2O_2

. The

O-H

bond length in

H_2O_2

is

\underline{Y}

than the

O-F

bond in

F_2O_2

. Choose the correct option for X and Y from those given below

(A)X-shorter, Y-longer
(B)X-shorter, Y-shorter
(C)X-longer, Y-shorter
(D)X-longer, Y-longer

Q117·ChemistrySingle correctJEE Main 2023

The correct order of bond enthalpy (kJmol

^{-1}

) is:

(A) $C-C>Si-Si>Sn-Sn>Ge-Ge$
(B) $C-C>Si-Si>Ge-Ge>Sn-Sn$
(C) $Si-Si>C-C>Sn-Sn>Ge-Ge$
(D) $Si-Si>C-C>Ge-Ge>Sn-Sn$

Q118·ChemistrySingle correctJEE Main 2023

The Lewis acid character of boron tri halides follows the order:

(A) $BI_3>BBr_3>BCl_3>BF_3$
(B) $BBr_3>BI_3>BCl_3>BF_3$
(C) $BCl_3>BF_3>BBr_3>BI_3$
(D) $BF_3>BCl_3>BBr_3>BI_3$

Q119·ChemistrySingle correctJEE Main 2023

Identify X, Y and Z in the following reaction. (Equation not balanced)

ClO + NO_2 \rightarrow X \xrightarrow{H_2O} Y + Z

(A)X = $ClONO_2$ , Y = HOCl, Z = $HNO_3$
(B)X = $ClONO_2$ , Y = HOCl, Z = $NO_2$
(C)X = $ClNO_2$ , Y = HCl, Z = $HNO_3$
(D)X = $ClNO_3$ , Y = $Cl_2$ , Z = $NO_2$

Q120·ChemistryNumericalJEE Main 2023

The oxidation state of phosphorus in hypophosphoric acid is

+

___ .

Q121·ChemistrySingle correctJEE Main 2023

The correct increasing order of the ionic radii is

(A) $S^{2-} < Cl^- < Ca^{2+} < K^+$
(B) $K^+ < S^{2-} < Ca^{2+} < Cl^-$
(C) $Ca^{2+} < K^+ < Cl^- < S^{2-}$
(D) $Cl^- < Ca^{2+} < K^+ < S^{2-}$

Q122·ChemistrySingle correctJEE Main 2023

Given below are two statements: Statement I: Upon heating a borax bead dipped in cupric sulphate in a luminous flame, the colour of the bead becomes green. Statement II: The green colour observed is due to the formation of copper(I) metaborate. In the light of the above statements, choose the most appropriate answer from the options given below:

(A)Both Statement I and Statement II are true
(B)Statement I is true but Statement II is false
(C)Statement I is false but Statement II is true
(D)Both Statement I and Statement II are false

Q123·ChemistrySingle correctJEE Main 2023

Boric acid is solid, whereas

BF_3

is gas at room temperature because of:

(A)Strong van der Waal's interaction in Boric acid
(B)Strong covalent bond in $BF_3$
(C)Strong ionic bond in Boric acid
(D)Strong hydrogen bond in Boric acid

Q124·ChemistrySingle correctJEE Main 2023

The bond dissociation energy of the "E-H" bond of the "

H_2E

" hydrides of group 16 elements (A. O, B. S, C. Se, D. Te) follows the order. Choose the correct one from the options given below:

(A) $B>A>C>D$
(B) $A>B>D>C$
(C) $A>B>C>D$
(D) $D>C>B>A$

Q125·ChemistryNumericalJEE Main 2023

Total number of acidic oxides among

N_2O_3,\,NO_2,\,N_2O,\,Cl_2O_7,\,SO_2,\,CO,\,CaO,\,Na_2O

and

NO

is _____.

Q126·ChemistrySingle correctJEE Main 2023

"A" obtained by Ostwald's method involving air oxidation of NH

_3

, upon further air oxidation produces "B". "B" on hydration forms an oxoacid of Nitrogen along with evolution of "A". The oxoacid also produces "A" and gives positive brown ring test. Identify A and B, respectively.

(A)N $_2$ O $_3$ , NO $_2$
(B)NO $_2$ , N $_2$ O $_4$
(C)NO $_2$ , N $_2$ O $_5$
(D)NO, NO $_2$

Q127·ChemistrySingle correctJEE Main 2023

The bond dissociation energy is highest for:

(A)F $_2$
(B)Br $_2$
(C)I $_2$
(D)Cl $_2$

Q128·ChemistrySingle correctJEE Main 2023

Given below are two statements: Statement I: The decrease in first ionization enthalpy from B to Al is much larger than that from Al to Ga. Statement II: The d orbitals in Ga are completely filled. In the light of the above statements, choose the most appropriate answer from the options given below:

(A)Statement I is incorrect but statement II is correct
(B)Both the statements I and II are correct
(C)Both the statements I and II are incorrect
(D)Statement I is correct but statement II is incorrect

Q129·ChemistrySingle correctJEE Main 2023

Inert gases have positive electron gain enthalpy. Its correct order is:

(A) $He < Kr < Xe < Ne$
(B) $He < Xe < Kr < Ne$
(C) $He < Ne < Kr < Xe$
(D) $Xe < Kr < Ne < He$

Q130·ChemistrySingle correctJEE Main 2023

Which of the following represents the correct order of metallic character of the given elements ?

(A) $Si < Be < Mg < K$
(B) $Be < Si < K < Mg$
(C) $Be < Si < Mg < K$
(D) $K < Mg < Be < Si$

Q131·ChemistrySingle correctJEE Main 2023

Reaction of thionyl chloride with white phosphorus forms a compound [A], which on hydrolysis gives [B], a dibasic acid. [A] and [B] are respectively:

(A) $P_4O_6$ and $H_3PO_3$
(B) $PCl_3$ and $H_3PO_4$
(C) $POCl_3$ and $H_3PO_4$
(D) $PCl_3$ and $H_3PO_3$

Q132·ChemistrySingle correctJEE Main 2023

Match List I with List II (industrial processes/catalysts and their applications) and choose the correct answer from the options given below.

LIST I	LIST II
A.Cobalt catalyst	I. $(H_2 + Cl_2)$ production
B.Syngas	II.Water gas production
C.Nickel catalyst	III.Coal gasification
D.Brine solution	IV.Methanol production

(A)A-IV, B-I, C-II, D-III
(B)A-IV, B-III, C-II, D-I
(C)A-II, B-III, C-IV, D-I
(D)A-IV, B-III, C-I, D-II

Q133·ChemistrySingle correctJEE Main 2023

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Carbon forms two important oxides - CO and

CO_2

. CO is neutral whereas

CO_2

is acidic in nature. Reason R :

CO_2

can combine with water in a limited way to form carbonic acid, while CO is sparingly soluble in water. In the light of the above statements, choose the most appropriate answer from the options given below

(A)Both A and R are correct but R is NOT the correct explanation of A
(B)A is correct but R is not correct
(C)Both A and R are correct and R is the correct explanation of A
(D)A is not correct but R is correct

Q134·ChemistryNumericalJEE Main 2023

Sum of

\pi

-bonds present in peroxodisulphuric acid and pyrosulphuric acid is:

Q135·ChemistrySingle correctJEE Main 2023

Which of the Phosphorus oxoacid can create silver mirror from

\text{AgNO}_3

solution?

(A) $(\text{HPO}_3)_n$
(B) $\text{H}_4\text{P}_2\text{O}_6$
(C) $\text{H}_4\text{P}_2\text{O}_5$
(D) $\text{H}_4\text{P}_2\text{O}_7$

Q136·ChemistryIntegerJEE Advanced 2022

The reaction of Xe and

\mathrm{O_2F_2}

gives a Xe compound

\mathbf{P}

. The number of moles of HF produced by the complete hydrolysis of 1 mol of

\mathbf{P}

is____.

Q137·ChemistryMultiple correctJEE Advanced 2022

The compound(s) which react(s) with

\mathrm{NH_3}

to give boron nitride (BN) is(are)

(A)B
(B) $\mathrm{B_2H_6}$
(C) $\mathrm{B_2O_3}$
(D) $\mathrm{HBF_4}$

Q138·ChemistrySingle correctJEE Advanced 2022

The reaction of

\mathrm{Pb\left(NO_3\right)_2}

and NaCl in water produces a precipitate that dissolves upon the addition of HCl of appropriate concentration. The dissolution of the precipitate is due to the formation of

(A) $\mathrm{PbCl_2}$
(B) $\mathrm{PbCl_4}$
(C) $\left[\mathrm{PbCl_4}\right]^{2-}$
(D) $\left[\mathrm{PbCl_6}\right]^{2-}$

Q139·ChemistryMultiple correctJEE Advanced 2022

The treatment of galena with

\mathrm{HNO_3}

produces a gas that is

(A)paramagnetic
(B)bent in geometry
(C)an acidic oxide
(D)colorless

Q140·ChemistryNumericalJEE Advanced 2022

Dissolving 1.24 g of white phosphorous in boiling NaOH solution in an inert atmosphere gives a gas

\mathbf{Q}

. The amount of

\mathrm{CuSO_4}

(in g) required to completely consume the gas

\mathbf{Q}

is ________. [Given: Atomic mass of H = 1, O = 16, Na = 23, P = 31, S = 32, Cu = 63]

Q141·ChemistrySingle correctJEE Advanced 2022

The reaction of

\mathrm{HClO_3}

with HCl gives a paramagnetic gas, which upon reaction with

\mathrm{O_3}

produces

(A) $\mathrm{Cl_2O}$
(B) $\mathrm{ClO_2}$
(C) $\mathrm{Cl_2O_6}$
(D) $\mathrm{Cl_2O_7}$

Q142·ChemistrySingle correctJEE Main 2022

When borax is heated with CoO on a platinum loop, blue coloured bead formed is largely due to :

(A)B $_{2}$ O $_{3}$
(B)Co(BO $_{2}$ ) $_{2}$
(C)CoB $_{4}$ O $_{7}$
(D)Co[B $_{4}$ O $_{5}$ (OH) $_{4}$ ]

Q143·ChemistryNumericalJEE Main 2022

Consider the following sulphure based oxoacids. H

_{2}

SO

_{3}

, H

_{2}

SO

_{4}

, H

_{2}

S

_{2}

O

_{8}

and H

_{2}

S

_{2}

O

_{7}

. Amongst these oxoacids, the number of those with peroxo(O-O) bond is______.

Q144·ChemistryNumericalJEE Main 2022

The number of interhalogens from the following having square pyramidal structure is : ClF

_3

, IF

_7

, BrF

_5

, BrF

_3

, I

_2

Cl

_6

, IF

_5

, ClF, ClF

_5

Q145·ChemistrySingle correctJEE Main 2022

Dinitrogen and dioxygen. the main constituents of air do not react with each other in atmosphere to form oxides of nitrogen because

(A) $\mathrm{N_2}$ is unreactive in the condition of atmosphere.
(B)Oxides of nitrogen are unstable.
(C)Reaction between them can occur in the presence of a catalyst.
(D)The reaction is endothermic and require very high temperature.

Q146·ChemistrySingle correctJEE Main 2022

Match List-I with List-II, match the gas evolved during each reaction. Choose the correct answer from the options given below :

List-I	List-II
A.(NH $_4$ ) $_2$ Cr $_2$ O $_7$ $\xrightarrow{\Delta}$	I.H $_2$
B.KMnO $_4$ + HCl →	II.N $_2$
C.Al + NaOH + H $_2$ O →	III.O $_2$
D.NaNO $_3$ $\xrightarrow{\Delta}$	IV.Cl $_2$

(A)(A) – (II), (B) – (III), (C) – (I), (D) – (IV)
(B)(A) – (III), (B) – (I), (C) – (IV), (D) – (II)
(C)(A) – (II), (B) – (IV), (C) – (I), (D) – (III)
(D)(A) – (III), (B) – (IV), (C) – (I), (D) – (II)

Q147·ChemistrySingle correctJEE Main 2022

Concentrated

\mathrm{HNO_3}

reacts with Iodine to give

(A) $\mathrm{HI}$ , $\mathrm{NO_2}$ and $\mathrm{H_2O}$
(B) $\mathrm{HIO_2}$ , $\mathrm{N_2O}$ and $\mathrm{H_2O}$
(C) $\mathrm{HIO_3}$ , $\mathrm{NO_2}$ and $\mathrm{H_2O}$
(D) $\mathrm{HIO_4}$ , $\mathrm{N_2O}$ and $\mathrm{H_2O}$

Q148·ChemistrySingle correctJEE Main 2022

White phosphorus reacts with thionyl chloride to give

(A) $\mathrm{PCl_5}$ , $\mathrm{SO_2}$ and $\mathrm{S_2Cl_2}$
(B) $\mathrm{PCl_3}$ . $\mathrm{SO_2}$ and $\mathrm{S_2Cl_2}$
(C) $\mathrm{PCl_3}$ , $\mathrm{SO_2}$ and $\mathrm{Cl_2}$
(D) $\mathrm{PCl_5}$ , $\mathrm{SO_2}$ and $\mathrm{Cl_2}$

Q149·ChemistrySingle correctJEE Main 2022

Which oxoacid of phosphorous has the highest number of oxygen atoms present in its chemical formula?

(A)Pyrophosphorous acid
(B)Hypophosphoric acid
(C)Phosphoric acid
(D)Pyrophosphoric acid

Q150·ChemistrySingle correctJEE Main 2022

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R) Assertion (A) : Boron is unable to form BF

_{6}^{3-}

Reason (R) : Size of B is very small. In the light of the above statements, choose the correct answer from the options given below:

(A)Both (A) and (R) are true and (R) is the correct explanation of (A)
(B)Both (A) and (R) are true but (R) is not the correct explanation of (A)
(C)(A) is true but (R) is false
(D)(A) is false but (R) is true

Q151·ChemistrySingle correctJEE Main 2022

The metal that has very low melting point and its periodic position is closer to a metalloid is :

(A)Al
(B)Ga
(C)Se
(D)In

Q152·ChemistrySingle correctJEE Main 2022

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Boric acid is a weak acid Reason R : Boric acid is not able to release

H^{+}

ion on its own. It receives

OH^{-}

ion from water and releases

H^{+}

ion. In the light of the above statements, choose the most appropriate answer from the options given below.

(A)Both A and R are correct and R is the correct explanation of A
(B)Both A and R are correct but R is NOT the correct explanation of A
(C)A is correct but R is not correct
(D)A is not correct but R is correct

Q153·ChemistrySingle correctJEE Main 2022

Borazine, also known as inorganic benzene, can be prepared by the reaction of 3-equivalents of "X" with 6-equivalents of "Y". "X" and "Y", respectively are :

(A)B(OH) $_3$ and NH $_3$
(B)B $_2$ H $_6$ and NH $_3$
(C)B $_2$ H $_6$ and HN $_3$
(D)NH $_3$ and B $_2$ O $_3$

Q154·ChemistryNumericalJEE Main 2022

The number of non-ionisable protons present in the product B obtained from the following reaction is ______.

C_{2}H_{5}OH

+

PCl_{3}

→

C_{2}H_{5}Cl

+ A A +

PCl_{3}

→ B

Q155·ChemistrySingle correctJEE Main 2022

The geometry around boron in the product 'B' formed from the following reaction is

BF_{3} + NaH \xrightarrow{450K} A + NaF

A + NMe_{3} \rightarrow B

(A)trigonal planar
(B)tetrahedral
(C)pyramidal
(D)square planar

Q156·ChemistrySingle correctJEE Main 2022

The interhalogen compound formed from the reaction of bromine with excess of fluorine is a :

(A)hypohalite
(B)halate
(C)perhalate
(D)halite

Q157·ChemistrySingle correctJEE Main 2022

The oxoacid of phosphorus that is easily obtained from a reaction of alkali and white phosphorus and has two P-H bonds, is :

(A)Phosphonic acid
(B)Phosphinic acid
(C)Pyrophosphorus acid
(D)Hypophosphoric acid

Q158·ChemistrySingle correctJEE Main 2022

Match the List-I with List- II. Choose the most appropriate answer from the option given below:

List-I (Metal)	List-II Application
A.Cs	I.High temperature thermometer
B.Ga	II.Water repellent sprays
C.B	III.Photoelectric cells
D.Si	IV.Bullet proof vest

(A)(A)-(III), (B)-(I), (C)-(IV), (D)-(II)
(B)(A)-(IV), (B)-(III), (C)-(II), (D)-(I)
(C)(A)-(II), (B)-(III), (C)-(IV), (D)-(I)
(D)(A)-(I), (B)-(IV), (C)-(II), (D)-(III)

Q159·ChemistrySingle correctJEE Main 2022

Aqueous solution of which of the following boron compounds will be strongly basic in nature?

(A)NaBH $_4$
(B)LiBH $_4$
(C)B $_2$ H $_6$
(D)Na $_2$ B $_4$ O $_7$

Q160·ChemistrySingle correctJEE Main 2022

Which of the following oxoacids of sulphur contains “S” in two different oxidation states?

(A)H $_2$ S $_2$ O $_3$
(B)H $_2$ S $_2$ O $_6$
(C)H $_2$ S $_2$ O $_7$
(D)H $_2$ S $_2$ O $_8$

Q161·ChemistrySingle correctJEE Main 2022

Given below are two statements : Statement -I :The pentavalent oxide of group- 15 element.

E_2O_5

. is less acidic than trivalent oxide.

E_2O_3

. of the same element. Statement -II :The acidic character of trivalent oxide of group 15 elements.

E_2O_3

. decreases down the group. In light of the above statements. choose most appropriate answer from the options given below:

(A)Both Statement I and Statement II are true.
(B)Both Statement I and Statement II are false.
(C)Statement I true. but statement II is false.
(D)Statement I is false but statement II is true.

Q162·ChemistrySingle correctJEE Main 2022

Among the given oxides of nitrogen; N

_2

O, N

_2

O

_3

, N

_2

O

_4

and N

_2

O

_5

, the number of compound/(s) having N–N bond is :

(A)1
(B)2
(C)3
(D)4

Q163·ChemistrySingle correctJEE Main 2022

Nitrogen gas is obtained by thermal decomposition of

(A) $Ba(NO_3)_2$
(B) $Ba(N_3)_2$
(C) $NaNO_2$
(D) $NaNO_3$

Q164·ChemistrySingle correctJEE Main 2022

Heating white phosphorus with conc. NaOH solution gives mainly

(A) $Na_{3}P$ and $H_{2}O$
(B) $H_{3}PO$ and NaH
(C) $P(OH)_{3}$ and $NaH_{2}PO_{4}$
(D) $PH_{3}$ and $NaH_{2}PO_{2}$

Q165·ChemistrySingle correctJEE Main 2022

Match List-I with List-II List-I (Si-Compounds) (A)

(CH_{3})_{4}Si

(B)

(CH_{3})Si(OH)_{3}

(C)

(CH_{3})_{2}Si(OH)_{2}

(D)

(CH_{3})_{3}Si(OH)

List-II (Si-Polymeric/other products) (I) Chain silicone (II) Dimeric silicone (III) Silane (IV) 2D – Silicone Choose the correct answer from the options given below:

(A)(A) – (III), (B) – (II), (C) – (I), (D) – (IV)
(B)(A) – (IV), (B) – (I), (C) – (II), (D) – (III)
(C)(A) – (II), (B) – (I), (C) – (IV), (D) – (III)
(D)(A) – (III), (B) – (IV), (C) – (I), (D) – (II)

Q166·ChemistrySingle correctJEE Main 2022

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Flourine forms one oxoacid. Reason R : Flourine has smallest size amongst all halogens and is highly electronegative In the light of the above statements, choose the most appropriate answer from the options given below.

(A)Both A and R are correct and R is the correct explanation of A.
(B)Both A and R are correct but R is NOT the correct explanation of A.
(C)A is correct but R is not correct.
(D)A is not correct but R is correct

Q167·ChemistrySingle correctJEE Main 2022

The gas produced by treating an aqueous solution of ammonium chloride with sodium nitrite is

(A)NH $_3$
(B)N $_2$
(C)N $_2$ O
(D)Cl $_2$

Q168·ChemistrySingle correctJEE Main 2022

Consider the following reaction : A + alkali → B (Major Product) If B is an oxoacid of phosphorus with no P–H bond, then A is :

(A)White $P_{4}$
(B)Red $P_{4}$
(C) $P_{2}O_{3}$
(D) $H_{3}PO_{3}$

Q169·ChemistrySingle correctJEE Main 2022

Choose the correct stability order of group 13 elements in their +1 oxidation state.

(A)Al < Ga < In < Tl
(B)Tl < In < Ga < Al
(C)Al < Ga < Tl < In
(D)Al < Tl < Ga < In

Q170·ChemistrySingle correctJEE Main 2022

The correct order of melting points of hydrides of group 16 elements is :

(A) $H_{2}S < H_{2}Se < H_{2}Te < H_{2}O$
(B) $H_{2}O < H_{2}S < H_{2}Se < H_{2}Te$
(C) $H_{2}S < H_{2}Te < H_{2}Se < H_{2}O$
(D) $H_{2}Se < H_{2}S < H_{2}Te < H_{2}O$

Q171·ChemistrySingle correctJEE Main 2022

The oxide which contains an odd electron at the nitrogen atom is

(A) $N_2O$
(B) $NO_2$
(C) $N_2O_3$
(D) $N_2O_5$

Q172·ChemistrySingle correctJEE Main 2022

The number of bridged oxygen atoms present in compound B formed from the following reactions is Pb(NO

_3

)

_2

\xrightarrow{673\ K}

A + PbO + O

_2

A

\xrightarrow{Dimerise}

B

(A)0
(B)1
(C)2
(D)3

Q173·ChemistryNumericalJEE Main 2022

Consider the following reactions : PCl

_3

+ H

_2

O

\longrightarrow

A + HCl A + H

_2

O

\longrightarrow

B + HCl number of ionisable protons present in the product B_________.

Q174·ChemistrySingle correctJEE Main 2022

PCl

_5

is well known. but NCl

_5

is not. Because.

(A)nitrogen is less reactive than phosphorous.
(B)nitrogen doesn't have d-orbitals in its valence shell.
(C)catenation tendency is weaker in nitrogen than phosphorous.
(D)size of phosphorous is larger than nitrogen.

Q175·ChemistrySingle correctJEE Main 2022

Which one of the following elemental forms is not present in the enamel of the teeth?

(A)Ca $^{2+}$
(B)P $^{3+}$
(C)F $^-$
(D)P $^{5+}$

Q176·ChemistrySingle correctJEE Main 2022

The most stable trihalide of nitrogen is:

(A)NF $_3$
(B)NCl $_3$
(C)NBr $_3$
(D)NI $_3$

Q177·ChemistrySingle correctJEE Main 2022

Identify the correct statement for B

_2

H

_6

from those given below. (A) In B

_2

H

_6

, all B-H bonds are equivalent. (B) In B

_2

H

_6

there are four 3-centre-2-electron bonds. (C) B

_2

H

_6

is a Lewis acid. (D) B

_2

H

_6

can be synthesized form both BF

_3

and NaBH

_4

. (E) B

_2

H

_6

is a planar molecule. Choose the most appropriate answer from the options given below :

(A)(A) and (E) only
(B)(B), (C) and (E) only
(C)(C) and (D) only
(D)(C) and (E) only

Q178·ChemistryIntegerJEE Advanced 2021

Ozonolysis of ClO

_{2}

produces an oxide of chlorine. The average oxidation state of chlorine in this oxide is ___.

Q179·ChemistryMultiple correctJEE Advanced 2021

The correct statement(s) related to oxoacids of phosphorous is(are)

(A)Upon heating, H $_{3}$ PO $_{3}$ undergoes disproportionation reaction to produce H $_{3}$ PO $_{4}$ and PH $_{3}$ .
(B)While H $_{3}$ PO $_{3}$ can act as reducing agent, H $_{3}$ PO $_{4}$ cannot.
(C)H $_{3}$ PO $_{3}$ is a monobasic acid.
(D)The H atom of P–H bond in H $_{3}$ PO $_{3}$ is not ionizable in water.

Q180·ChemistrySingle correctJEE Main 2021

The oxide without nitrogen-nitrogen bond is :

(A)N $_{2}$ O
(B)N $_{2}$ O $_{4}$
(C)N $_{2}$ O $_{3}$
(D)N $_{2}$ O $_{5}$

Q181·ChemistryNumericalJEE Main 2021

The number of halogen/(s) forming halic (V) acid is ______.

Q182·ChemistrySingle correctJEE Main 2021

Which one of the following correctly represents the order of stability of oxides,

\mathrm{X_2O}

; (X = halogen) ?

(A)Br > Cl > I
(B)Br > I > Cl
(C)Cl > I > Br
(D)I > Cl > Br

Q183·ChemistrySingle correctJEE Main 2021

The number of

\mathrm{S=O}

bonds present in sulphurous acid, peroxodisulphuric acid and pyrosulphuric acid, respectively are :

(A)2, 3 and 4
(B)1, 4 and 3
(C)2, 4 and 3
(D)1, 4 and 4

Q184·ChemistrySingle correctJEE Main 2021

Which one of the following is used to remove most of plutonium from spent nuclear fuel?

(A)ClF $_{3}$
(B)O $_{2}$ F $_{2}$
(C)I $_{2}$ O $_{5}$
(D)BrO $_{3}$

Q185·ChemistrySingle correctJEE Main 2021

Match List-I with List-II : List-I (Species) List-II (Number of lone pairs of electrons on the central atom) (a)

\mathrm{XeF_2}

(b)

\mathrm{XeO_2F_2}

(c)

\mathrm{XeO_3F_2}

(d)

\mathrm{XeF_4}

(i) 0 (ii) 1 (iii) 2 (iv) 3 Choose the most appropriate answer from the options given below :

(A)(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
(B)(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
(C)(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
(D)(a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)

Q186·ChemistrySingle correctJEE Main 2021

In which one of the following molecules strongest back donation of an electron pair from halide to boron is expected?

(A) $\mathrm{BCl_3}$
(B) $\mathrm{BF_3}$
(C) $\mathrm{BBr_3}$
(D) $\mathrm{BI_3}$

Q187·ChemistrySingle correctJEE Main 2021

Which one of the following is formed (mainly) when red phosphorus is heated in a sealed tube at 803 K ?

(A)White phosphorus
(B)Yellow phosphorus
(C)β-Black phosphorus
(D)α-Black phosphorus

Q188·ChemistrySingle correctJEE Main 2021

The incorrect statement is:

(A) $\mathrm{Cl_2}$ is more reactive than ClF.
(B) $\mathrm{F_2}$ is more reactive than ClF.
(C)On hydrolysis ClF froms HOCl and HF.
(D) $\mathrm{F_2}$ is a stronger oxidizing agent than $\mathrm{Cl_2}$ in aqueous solution

Q189·ChemistrySingle correctJEE Main 2021

The number of non-ionisable hydrogen atoms present in the final product obtained from the hydrolysis of

\mathrm{PCl_5}

is :

(A)0
(B)2
(C)1
(D)3

Q190·ChemistrySingle correctJEE Main 2021

The conversion of hydroxyapatite occurs due to presence of

\mathrm{F^-}

ions in water. The correct formula of hydroxyapatite is:

(A) $[3\mathrm{Ca_3(PO_4)_2} \cdot \mathrm{Ca(OH)_2}]$
(B) $[3\mathrm{Ca(OH)_2} \cdot \mathrm{CaF_2}]$
(C) $[\mathrm{Ca_3(PO_4)_2} \cdot \mathrm{CaF_2}]$
(D) $[3\mathrm{Ca_3(PO_4)_2} \cdot \mathrm{CaF_2}]$

Q191·ChemistrySingle correctJEE Main 2021

Chalcogen group elements are :

(A)Se, Tb and Pu.
(B)Se, Te and Po.
(C)S, Te and Pm.
(D)O, Ti and Po.

Q192·ChemistrySingle correctJEE Main 2021

Number of Cl=O bonds in chlorous acid, chloric acid and perchloric acid respectively are:

(A)4,1 and 0
(B)1,1 and 3
(C)1,2 and 3
(D)3,1 and 1

Q193·ChemistrySingle correctJEE Main 2021

The oxidation states of 'P' in

H_4P_2O_7

,

H_4P_2O_5

and

H_4P_2O_6

, respectively are:

(A)5,3 and 4
(B)5,4 and 3
(C)6,4 and 5
(D)7,5 and 6

Q194·ChemistrySingle correctJEE Main 2021

Which one of the following compounds of Group-14 elements is not known?

(A) $[GeCl_6]^{2-}$
(B) $[Sn(OH)_6]^{2-}$
(C) $[SiF_6]^{2-}$
(D) $[SiCl_6]^{2-}$

Q195·ChemistrySingle correctJEE Main 2021

Which one of the following group − 15 hydride is the strongest reducing agent ?

(A) $AsH_{3}$
(B) $SbH_{3}$
(C) $BiH_{3}$
(D) $PH_{3}$

Q196·ChemistrySingle correctJEE Main 2021

Given below are the statements about diborane. (a) Diborane is prepared by the oxidation of

NaBH_{4}

With

I_{2}

. (b) Each boron atom is in

sp^{2}

hybridized state. (c) Diborane has one bridged 3 centre − 2 − electron bond. (d) Diborane is a planar molecule. The option with correct statement(s) is :

(A)(a) only
(B)(c) only
(C)(a) and (b) only
(D)(c) and (d) only

Q197·ChemistrySingle correctJEE Main 2021

Chemical nature of the nitrogen oxide compound obtained from a reaction of concentrated nitric acid and

P_4O_{10}

(in 4:1 ratio) is:

(A)basic
(B)neutral
(C)amphoteric
(D)acidic

Q198·ChemistrySingle correctJEE Main 2021

The set in which compounds have different nature is:

(A) $B(OH)_{3}$ and Al $(OH)_{3}$
(B) $B(OH)_{3}$ and $H_{3}PO_{3}$
(C)NaOH and $Ca(OH)_{2}$
(D) $Be(OH)_{2}$ and $Al(OH)_{3}$

Q199·ChemistryNumericalJEE Main 2021

A xenon compound 'A' upon partial hydrolysis gives XeO

_{2}

F

_{2}

. The number of lone pair of electrons present in compound A is _______ (Round off to the Nearest integer)

Q200·ChemistrySingle correctJEE Main 2021

The number of ionisable hydrogens present in the product obtained from a reaction of phosphorus trichloride and phosphonic acid is:

(A)3
(B)0
(C)2
(D)1

Q201·ChemistryNumericalJEE Main 2021

The reaction of white phosphorus on boiling with alkali in inert atmosphere resulted in the formation of product 'A'. The reaction 1 mol of 'A' with excess of

\mathrm{AgNO_3}

in aqueous medium gives ________ mol(s) of Ag. (Round off to the Nearest Integer).

Q202·ChemistrySingle correctJEE Main 2021

The set that represents the pair of neutral oxides of nitrogen is :

(A)NO and N $_{2}$ O
(B)N $_{2}$ O and N $_{2}$ O $_{3}$
(C)N $_{2}$ O and NO $_{2}$
(D)NO and NO $_{2}$

Q203·ChemistrySingle correctJEE Main 2021

A group 15 element, which is a metal and forms a hydride with strongest reducing power among group 15 hydrides. The element is :

(A)Sb
(B)P
(C)As
(D)Bi

Q204·ChemistrySingle correctJEE Main 2021

Match List-I (Name of oxo acid) with List-II (Oxidation state of 'P') : Choose the correct answer from the options given below :

List-I (Name of oxo acid)	List-II (Oxidation state of 'P')
a.Hypophosphorous acid	i.+5
b.Orthophosphoric acid	ii.+4
c.Hypophosphoric acid	iii.+3
d.Orthophosphorous acid	iv.+2
	v.+1

(A)(a)-(v), (b)-(i), (c)-(ii), (d)-(iii)
(B)(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
(C)(a)-(iv), (b)-(v), (c)-(ii), (d)-(iii)
(D)(a)-(v), (b)-(iv), (c)-(ii), (d)-(iii)

Q205·ChemistrySingle correctJEE Main 2021

The INCORRECT statement regarding the structure of C

_{60}

is :

(A)The six-membered rings are fused to both six and five-membered rings.
(B)Each carbon atom forms three sigma bonds.
(C)The five-membered rings are fused only to six-membered rings.
(D)It contains 12 six-membered rings and 24 five-membered rings.

Q206·ChemistrySingle correctJEE Main 2021

Match List-I (Industrial process) with List-II (Application) : Choose the correct answer from the options given below :

List-I (Industrial process)	List-II (Application)
a.Haber's process	i.HNO $_{3}$ synthesis
b.Ostwald's process	ii.Aluminium extraction
c.Contact process	iii.NH $_{3}$ synthesis
d.Hall-Heroult process	iv.H $_{2}$ SO $_{4}$ synthesis

(A)(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
(B)(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
(C)(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
(D)(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)

Q207·ChemistrySingle correctJEE Main 2021

The exact volumes of 1 M NaOH solution required to neutralise 50 mL of 1 M H

_{3}

PO

_{3}

solution and 100 mL of 2 M H

_{3}

PO

_{2}

solution, respectively, are :

(A)100 mL and 100 mL
(B)100 mL and 50 mL
(C)100 mL and 200 mL
(D)50 mL and 50 mL

Q208·ChemistrySingle correctJEE Main 2021

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: In TlI

_3

, isomorphous to CsI

_3

, the metal is present in +1 oxidation state. Reason R: Tl metals has fourteen f electrons in its electronic configuration. In the light of the above statements, choose the most appropriate answer from the options given below:

(A)Both A and R are correct and R is the correct explanation of A
(B)A is not correct but R is correct
(C)Both A and R are correct R is NOT the correct explanation of A
(D)A is correct but R is not correct

Q209·ChemistrySingle correctJEE Main 2021

Which pair of oxides is acidic in nature?

(A)N $_2$ O, BaO
(B)CaO, SiO $_2$
(C)B $_2$ O $_3$ , CaO
(D)B $_2$ O $_3$ , SiO $_2$

Q210·ChemistrySingle correctJEE Main 2021

Compound A used as a strong oxidizing agent is amphoteric in nature. It is the part of lead storage batteries. Compound A is :

(A)Pb $_3$ O $_4$
(B)PbO $_2$
(C)PbSO $_4$
(D)PbO

Q211·ChemistrySingle correctJEE Main 2021

Given below are two statements : Statement I : α and β forms of sulphur can change reversibly between themselves with slow heating or slow cooling. Statement II : At room temperature the stable crystalline form of sulphur is monoclinic sulphur. In the light of the above statements, choose the correct answer from the options given below.

(A)Both statement I and statement II are false
(B)Statement I is true but statement II is false
(C)Both statement I and statement II are true
(D)Statement I is false but statement II is true

Q212·ChemistryNumericalJEE Main 2021

Among the following, the number of halide(s) which is/are inert to hydrolysis is _______. (A) BF

_{3}

(B) SiCl

_{4}

(C) PCl

_{5}

(D) SF

_{6}

Q213·ChemistrySingle correctJEE Main 2021

The correct statement about B

_{2}

H

_{6}

is:

(A)All B−H−B angles are of 120°.
(B)Its fragment, BH $_{3}$ , behaves as a Lewis base.
(C)Terminal B−H bonds have less p-character when compared to bridging bonds.
(D)The two B−H−B bonds are not of same length.

Q214·ChemistrySingle correctJEE Main 2021

The correct order of bond dissociation enthalpy of halogen is :

(A)F2>Cl2>Br2>I2
(B)Cl2>F2>Br2>I2
(C)Cl2>Br2>F2>I2
(D)I2>Br2>Cl2>F2

Q215·ChemistryNumericalJEE Main 2021

Among the following allotropic forms of sulphur, the number of allotropic forms, which will show paramagnetism is _______. (1)

\alpha

-sulphur (2)

\beta

-sulphur (3)

S_{2}

-form

Q216·ChemistryMultiple correctJEE Advanced 2020

Choose the correct statement(s) among the following.

(A) $SnCl_{2}.2H_{2}O$ is a reducing agent.
(B) $SnO_{2}$ reacts with KOH to form $K_{2}[Sn(OH)_{6}]$ .
(C)A solution of $PbCl_{2}$ in HCl contains $Pb^{2+}$ and $Cl^{-}$ ions.
(D)The reaction of $Pb_{3}O_{4}$ with hot dilute nitric acid to give $PbO_{2}$ is a redox reaction.

Q217·ChemistryMultiple correctJEE Advanced 2020

With respect to hypochlorite, chlorate and perchlorate ions, choose the correct statement(s).

(A)The hypochlorite ion is the strongest conjugate base.
(B)The molecular shape of only chlorate ion is influenced by the lone pair of electrons of Cl.
(C)The hypochlorite and chlorate ions disproportionate to give rise to identical set of ions.
(D)The hypochlorite ion oxidizes the sulfite ion.

Q218·ChemistrySingle correctJEE Main 2020

The reaction of NO with N

_2

O

_4

at 250 K gives:

(A)N $_2$ O
(B)NO $_2$
(C)N $_2$ O $_3$
(D)N $_2$ O $_5$

Q219·ChemistrySingle correctJEE Main 2020

The correct statement with respect to dinitrogen is:

(A) $N_2$ is paramagnetic in nature
(B)It can combine with dioxygen at $25^\circ$ C.
(C)Liquid dinitrogen is not used in cryosurgery
(D)It can be used as an inert diluent for reactive chemicals

Q220·ChemistrySingle correctJEE Main 2020

Reaction of an inorganic sulphite X with dilute H

_2

SO

_4

generates compound Y. Reaction of Y with NaOH gives X. Further, the reaction of X. Further, the reaction of X with Y and water affords compound Z. Y and Z respectively, are:

(A)SO $_2$ and Na $_2$ SO $_3$
(B)SO $_3$ and NaHSO $_3$
(C)SO $_2$ and NaHSO $_3$
(D)S and Na $_2$ SO $_3$

Q221·ChemistrySingle correctJEE Main 2020

On heating, lead (II) nitrate gives a brown gas (A). The gas (A) on cooling changes to a colourless solid/liquid (B). (B) on heating with NO changes to a blue solid (C). The oxidation number of nitrogen in solid (C) is:

(A)+4
(B)+3
(C)+2
(D)+5

Q222·ChemistryNumericalJEE Main 2020

The volume (in mL) of 0.1 N NaOH required to neutralise 10 mL of 0.1 N phosphinic acid is ______.

Q223·ChemistrySingle correctJEE Main 2020

If the boiling point of H

_2

O is 373 K, the boiling point of H

_2

S will be:

(A)more than 373 K
(B)less than 300 K
(C)greater than 300 K but less than 373 K
(D)equal to 373 K

Q224·ChemistrySingle correctJEE Main 2020

Aqua regia is used for dissolving noble metals (Au, Pt, etc.). The gas evolved in this process is:

(A)NO
(B)N $_2$ O $_3$
(C)N $_2$
(D)N $_2$ O $_5$

Q225·ChemistrySingle correctJEE Main 2020

In a molecule of pyrophosphoric acid, the number of P

-

OH, P

=

O and P

-

O

-

P bonds/ moiety(ies) respectively are

(A)4, 2 and 1
(B)4, 2 and 0
(C)2, 4 and 1
(D)3, 3 and 3

Q226·ChemistrySingle correctJEE Main 2020

The reaction of H

_3

N

_3

B

_3

Cl

_3

(A) with LiBH

_4

in tetrahydrofuran gives inorganic benzene (B). Further, the reaction of (A) with (C) leads to H

_3

N

_3

B

_3

(Me)

_3

. Compounds (B) and (C) respectively, are:

(A)Borazine and MeBr
(B)Boron nitride and MeBr
(C)Diborane and MeMgBr
(D)Borazine and MeMgBr

Q227·ChemistrySingle correctJEE Main 2020

The number of bonds between sulphur and oxygen atoms in S

_2

O

_8^{-}

and the number of bonds between sulphur and sulphur atoms in rhombic sulphur, respectively, are :

(A)4 and 8
(B)4 and 6
(C)8 and 6
(D)8 and 8

Q228·ChemistrySingle correctJEE Main 2020

White phosphorus on reaction with concentrated NaOH solution in an inert atmosphere of CO

_2

gives phosphine and compound (X). (X) on acidification with HCl gives compound (Y). The basicity of compound (Y) is:

(A)2
(B)4
(C)3
(D)1

Q229·ChemistrySingle correctJEE Main 2020

In the following reactions, products(A) and (B) respectively are

\mathrm{NaOH + Cl_2} \xrightarrow{\text{Hot and Conc}} (A) + \text{side products}

\mathrm{Ca(OH)_2\,Cl_2} \xrightarrow{\text{Dry}} (B) + \text{side products}

(A) $\mathrm{NaClO_3}$ and $\mathrm{Ca(OCl)_2}$
(B) $\mathrm{NaOCl}$ and $\mathrm{Ca(OCl)_2}$
(C) $\mathrm{NaOCl}$ and $\mathrm{Ca(ClO_3)_2}$
(D) $\mathrm{NaClO_3}$ and $\mathrm{Ca(ClO_3)_2}$

Q230·ChemistryNumericalJEE Main 2020

Chlorine reacts with hot and concentrated NaOH and produces compound(X) and (Y). Compound(X) gives white precipitate with silver nitrate solution. The average bond order between Cl and O atoms in (Y) is

Q231·ChemistryMultiple correctJEE Advanced 2019

A tin chloride Q undergoes the following reactions (not balanced) Q + Cl

^{-}

\longrightarrow

X Q + Me

_{3}

N

\longrightarrow

Y Q + CuCl

_{2}

\longrightarrow

Z + CuCl X is a monoanion having pyramidal geometry. Both Y and Z are neutral compounds. Choose the correct option(s)

(A)The central atom in Z has one lone pair of electrons
(B)The central atom in X is sp $^{3}$ hybridized
(C)There is a coordinate bond in Y
(D)The oxidation state of the central atom in Z is +2

Q232·ChemistryMultiple correctJEE Advanced 2019

With reference to \textit{aqua regia}, choose the correct option(s)

(A)The yellow colour of \textit{aqua regia} is due to the presence of NOCl and Cl $_{2}$
(B)\textit{Aqua regia} is prepared by mixing conc. HCl and conc. HNO $_{3}$ in 3 : 1 (\textit{v/v}) ratio
(C)Reaction of gold with \textit{aqua regia} produces an anion having Au in +3 oxidation state
(D)Reaction of gold with \textit{aqua regia} produces NO $_{2}$ in the absence of air

Q233·ChemistryNumericalJEE Advanced 2019

At 143 K, the reaction of XeF

_{4}

with O

_{2}

F

_{2}

produces xenon compound Y. The total number of lone Pair(s) of electrons present on the whole molecule of Y is ……… .

Q234·ChemistrySingle correctJEE Main 2019

The basic structural unit of feldspar, zeolites, mica and asbestos is :

(A) $\left\{\overset{R}{\underset{R}{\text{Si}}}-\text{O}\right\}_n$ (R = Me)
(B) $(SiO_3)^{2-}$
(C) $SiO_2$
(D) $(SiO_4)^{4-}$

Q235·ChemistrySingle correctJEE Main 2019

The C–C bond length is maximum in

(A)graphite
(B)C $_{70}$
(C)diamond
(D)C $_{60}$

Q236·ChemistrySingle correctJEE Main 2019

The oxoacid of sulphur that does not contain bond between sulphur atoms is:

(A) $H_2S_2O_3$
(B) $H_2S_2O_4$
(C) $H_2S_2O_7$
(D) $H_2S_4O_6$

Q237·ChemistrySingle correctJEE Main 2019

The number of pentagons in C

_{60}

and trigons (triangles) in white phosphorus, respectively, are:

(A)12 and 3
(B)20 and 4
(C)12 and 4
(D)20 and 3

Q238·ChemistrySingle correctJEE Main 2019

The noble gas that does NOT occur in the atmosphere is:

(A)He
(B)Ra
(C)Ne
(D)Kr

Q239·ChemistrySingle correctJEE Main 2019

The correct order of catenation is:

(A)C > Sn > Si ≈ Ge
(B)Ge > Sn > Si > C
(C)Si > Sn > C > Ge
(D)C > Si > Ge ≈ Sn

Q240·ChemistrySingle correctJEE Main 2019

C_{60}

, an allotrope of carbon contains:

(A)20 hexagons and 12 pentagons.
(B)12 hexagons and 20 pentagons.
(C)18 hexagons and 14 pentagons.
(D)16 hexagons and 16 pentagons

Q241·ChemistrySingle correctJEE Main 2019

HF has highest boiling point among hydrogen halides, because it has:

(A)lowest dissociation enthalpy
(B)strongest van der Waals' interactions
(C)strongest hydrogen bonding
(D)lowest ionic character

Q242·ChemistrySingle correctJEE Main 2019

The correct order of the oxidation states of nitrogen in NO,

N_2O

,

NO_2

and

N_2O_3

is:

(A) $N_2O < N_2O_3 < NO < NO_2$
(B) $NO_2 < NO < N_2O_3 < N_2O$
(C) $NO_2 < N_2O_3 < NO < N_2O$
(D) $N_2O < NO < N_2O_3 < NO_2$

Q243·ChemistrySingle correctJEE Main 2019

The amorphous form of silica is:

(A)quartz
(B)kieselguhr
(C)cristobalite
(D)tridymite

Q244·ChemistrySingle correctJEE Main 2019

The correct statements among I to III regarding group 13 element oxides are, I. Boron trioxide is acidic II. Oxides of aluminium and gallium are amphoteric III. Oxides of indium and thallium are basic

(A)I, II and III
(B)II and III only
(C)I and III only
(D)I and II only

Q245·ChemistrySingle correctJEE Main 2019

Diborane (

B_2H_6

) reacts independently with

O_2

and

H_2O

to produce, respectively:

(A) $H_3BO_3$ and $B_2O_3$
(B) $B_2O_3$ and $H_3BO_3$
(C) $HBO_2$ and $H_3BO_3$
(D) $B_2O_3$ and $[BH_4]^-$

Q246·ChemistrySingle correctJEE Main 2019

The correct statement about

ICl_5

and

ICl_4^-

is:

(A) $ICl_5$ is trigonal bipyramidal and $ICl_4^-$ is tetrahedral
(B) $ICl_5$ is square pyramidal and $ICl_4^-$ is square planar
(C) $ICl_5$ is square pyramidal and $ICl_4^-$ is tetrahedral
(D)Both are isostructural

Q247·ChemistrySingle correctJEE Main 2019

The element that shows greater ability to form p

\pi

-p

\pi

multiple bonds, is:

(A)Sn
(B)C
(C)Ge
(D)Si

Q248·ChemistrySingle correctJEE Main 2019

Chlorine on reaction with hot and concentrated sodium hydroxide gives :

(A)Cl $^{-}$ and ClO $_{3}^{-}$
(B)Cl $^{-}$ and ClO $^{-}$
(C)ClO $_{3}^{-}$ and ClO $_{2}^{-}$
(D)Cl $^{-}$ and ClO $_{2}^{-}$

Q249·ChemistrySingle correctJEE Main 2019

The element that does NOT show catenation is :

(A)Ge
(B)Si
(C)Sn
(D)Pb

Q250·ChemistrySingle correctJEE Main 2019

The relative stability of +1 oxidation state of group 13 elements follows the order:

(A)Al < Ga < Tl < In
(B)Tl < In < Ga < Al
(C)Ga < Al < In < Tl
(D)Al < Ga < In < Tl

Q251·ChemistrySingle correctJEE Main 2019

The hydride that is NOT electron deficient is:

(A) $SiH_{4}$
(B) $B_{2}H_{6}$
(C) $GaH_{3}$
(D) $AlH_{3}$

Q252·ChemistrySingle correctJEE Main 2019

The chloride that CANNOT get hydrolysed is

(A) $PbCl_4$
(B) $CCl_4$
(C) $SnCl_4$
(D) $SiCl_4$

Q253·ChemistrySingle correctJEE Main 2019

Good reducing nature of H

_3

PO

_2

is attributed to the presence of

(A)Two P – OH bonds
(B)One P – H bond
(C)Two P – H bonds
(D)One P – OH bond

Q254·ChemistrySingle correctJEE Main 2019

Correct statements among a to d regarding silicones are (i) they are polymers with hydrophobic character (ii) they are biocompatible (iii) in general, they have high thermal stability and low dielectric strength (iv) usually they are resistant to oxidation and used as greases.

(A)(i), (ii), (iii) and (iv)
(B)(i), (ii) and (iii)
(C)(i) and (ii) only
(D)(i), (ii) and (iv)

Q255·ChemistrySingle correctJEE Main 2019

Aluminium is usually found in +3 oxidation state. In contrast, thallium exists in +1 and +3 oxidation states. This is due to

(A)inert pair effect
(B)diagonal relationship
(C)lattice effect
(D)lanthanoid contraction

Q256·ChemistryMultiple correctJEE Advanced 2018

Based on the compounds of group 15 elements, the correct statement(s) is (are)

(A) $Bi_{2}O_{5}$ is more basic than $N_{2}O_{5}$
(B) $NF_{3}$ is more covalent than $BiF_{3}$
(C) $PH_{3}$ boils at lower temperature than $NH_{3}$
(D)The N−N single bond is stronger than the P−P single bond

Q257·ChemistryNumericalJEE Advanced 2018

The total number of compounds having at least one bridging oxo group among the molecules given below is ____.

N_{2}O_{3}

,

N_{2}O_{5}

,

P_{4}O_{6}

,

P_{4}O_{7}

,

H_{4}P_{2}O_{5}

,

H_{5}P_{3}O_{10}

,

H_{2}S_{2}O_{3}

,

H_{2}S_{2}O_{5}

Q258·ChemistryMultiple correctJEE Advanced 2018

The compound(s) which generate(s)

N_{2}

gas upon thermal decomposition below 300°C is (are)

(A) $NH_{4}NO_{3}$
(B) $(NH_{4})_{2}Cr_{2}O_{7}$
(C) $Ba(N_{3})_{2}$
(D) $Mg_{3}N_{2}$

Q259·ChemistryMultiple correctJEE Advanced 2017

The colour of the

X_{2}

molecules of group 17 elements changes gradually from yellow to violet down the group. This is due to

(A)the physical state of $X_{2}$ at atom temperature changes from gas to solid down the group
(B)decrease in HOMO-LUMO gap down the group
(C)decrease in $\pi^{*}$ - $\sigma^{*}$ gap down the group
(D)decrease in ionization energy down the group

Q260·ChemistrySingle correctJEE Advanced 2017

PARAGRAPH 1 Upon heating

\mathrm{KClO_{3}}

in the presence of catalytic amount of

\mathrm{MnO_{2}}

, a gas W is formed. Excess amount of W reacts with white phosphorus to give X. The reaction of X with

\mathrm{HNO_{3}}

gives Y and Z. W and X are, respectively

(A) $\mathrm{O_{3}}$ and $\mathrm{P_{4}O_{6}}$
(B) $\mathrm{O_{2}}$ and $\mathrm{P_{4}O_{6}}$
(C) $\mathrm{O_{2}}$ and $\mathrm{P_{4}O_{10}}$
(D) $\mathrm{O_{3}}$ and $\mathrm{P_{4}O_{10}}$

Q261·ChemistrySingle correctJEE Advanced 2017

The order of the oxidation state of the phosphorus atom in

\mathrm{H_{3}PO_{2}}

,

\mathrm{H_{3}PO_{4}}

,

\mathrm{H_{3}PO_{3}}

, and

\mathrm{H_{4}P_{2}O_{6}}

is

(A) $\mathrm{H_{3}PO_{3}} > \mathrm{H_{3}PO_{2}} > \mathrm{H_{3}PO_{4}} > \mathrm{H_{4}P_{2}O_{6}}$
(B) $\mathrm{H_{3}PO_{4}} > \mathrm{H_{3}PO_{2}} > \mathrm{H_{3}PO_{3}} > \mathrm{H_{4}P_{2}O_{6}}$
(C) $\mathrm{H_{3}PO_{4}} > \mathrm{H_{4}P_{2}O_{6}} > \mathrm{H_{3}PO_{3}} > \mathrm{H_{3}PO_{2}}$
(D) $\mathrm{H_{3}PO_{2}} > \mathrm{H_{3}PO_{3}} > \mathrm{H_{4}P_{2}O_{6}} > \mathrm{H_{3}PO_{4}}$

Q262·ChemistryMultiple correctJEE Advanced 2017

The correct statement(s) about the oxoacids,

HClO_{4}

and

HClO

, is(are)

(A) $HClO_{4}$ is more acidic than $HClO$ because of the resonance stabilization of its anion
(B) $HClO_{4}$ is formed in the reaction between $Cl_{2}$ and $H_{2}O$
(C)The central atom in both $HClO_{4}$ and $HClO$ is $sp^{3}$ hybridized
(D)The conjugate base of $HClO_{4}$ is weaker base than $H_{2}O$

Q263·ChemistrySingle correctJEE Advanced 2017

PARAGRAPH 1 Upon heating

\mathrm{KClO_{3}}

in the presence of catalytic amount of

\mathrm{MnO_{2}}

, a gas W is formed. Excess amount of W reacts with white phosphorus to give X. The reaction of X with

\mathrm{HNO_{3}}

gives Y and Z. Y and Z are, respectively

(A) $\mathrm{N_{2}O_{3}}$ and $\mathrm{H_{3}PO_{4}}$
(B) $\mathrm{N_{2}O_{5}}$ and $\mathrm{HPO_{3}}$
(C) $\mathrm{N_{2}O_{4}}$ and $\mathrm{HPO_{3}}$
(D) $\mathrm{N_{2}O_{4}}$ and $\mathrm{H_{3}PO_{3}}$

Q264·ChemistryMultiple correctJEE Advanced 2016

The crystalline form of borax has

(A)tetranuclear $[B_{4}O_{5}(OH)_{4}]^{2-}$ unit
(B)all boron atoms in the same plane
(C)equal number of $sp^{2}$ and $sp^{3}$ hybridized boron atoms
(D)one terminal hydroxide per boron atom

Q265·ChemistryMultiple correctJEE Advanced 2016

The nitrogen containing compound produced in the reaction of

HNO_{3}

with

P_{4}O_{10}

(A)can also be prepared by reaction of $P_{4}$ and $HNO_{3}$
(B)is diamagnetic
(C)contains one N – N bond
(D)reacts with Na metal producing a brown gas

Q266·ChemistrySingle correctJEE Advanced 2016

The increasing order of atomic radii of the following Group 13 elements is

(A)Al < Ga < In < Tl
(B)Ga < Al < In < Tl
(C)Al < In < Ga < Tl
(D)Al < Ga < Tl < In

Q267·ChemistryMultiple correctJEE Advanced 2015

The correct statement(s) regarding, (i)

\mathrm{HClO}

, (ii)

\mathrm{HClO_{2}}

, (iii)

\mathrm{HClO_{3}}

and (iv)

\mathrm{HClO_{4}}

, is (are)

(A)The number of $\mathrm{Cl = O}$ bonds in (ii) and (iii) together is two
(B)The number of lone pairs of electrons on Cl in (ii) and (iii) together is three
(C)The hybridization of Cl in (iv) is $sp^{3}$
(D)Amongst (i) to (iv), the strongest acid is (i)

Q268·ChemistryIntegerJEE Advanced 2015

Three moles of

\mathrm{B_{2}H_{6}}

are completely reacted with methanol. The number of moles of boron containing product formed is

Q269·ChemistrySingle correctJEE Advanced 2014

The product formed in the reaction of

\mathrm{SOCl}_2

with white phosphorous is

(A) $\mathrm{PCl}_3$
(B) $\mathrm{SO_2Cl_2}$
(C) $\mathrm{SCl}_2$
(D) $\mathrm{POCl}_3$

Q270·ChemistryMultiple correctJEE Advanced 2014

The correct statement(s) for orthoboric acid is/are

(A)It behaves as a weak acid in water due to self ionization.
(B)Acidity of its aqueous solution increases upon addition of ethylene glycol.
(C)It has a three dimensional structure due to hydrogen bonding.
(D)It is a weak electrolyte in water.

Q271·ChemistrySingle correctJEE Advanced 2014

Under ambient conditions, the total number of gases released as products in the final step of the reaction scheme shown below is

(A)0
(B)1
(C)2
(D)3

Q272·ChemistrySingle correctJEE Advanced 2013

The unbalanced chemical reactions given in List – I show missing reagent or condition (?) which are provided in List – II. Match List – I with List – II and select the correct answer using the code given below the lists:

List – I	List – II
P. $\mathrm{PbO_2} + \mathrm{H_2SO_4} \xrightarrow{?} \mathrm{PbSO_4} + \mathrm{O_2} + \text{other product}$	1. $\mathrm{NO}$
Q. $\mathrm{Na_2S_2O_3} + \mathrm{H_2O} \xrightarrow{?} \mathrm{NaHSO_4} + \text{other product}$	2. $\mathrm{I_2}$
R. $\mathrm{N_2H_4} \xrightarrow{?} \mathrm{N_2} + \text{other product}$	3.Warm
S. $\mathrm{XeF_2} \xrightarrow{?} \mathrm{Xe} + \text{other product}$	4. $\mathrm{Cl_2}$

(A)P-4, Q-2, R-3, S-1
(B)P-3, Q-2, R-1, S-4
(C)P-1, Q-4, R-2, S-3
(D)P-3, Q-4, R-2, S-1

Q273·ChemistrySingle correctJEE Advanced 2013

The reactions of

\mathrm{Cl_2}

gas with cold-dilute and hot-concentrated NaOH in water give sodium salts of two (different) oxoacids of chlorine, P and Q, respectively. The

\mathrm{Cl_2}

gas reacts with

\mathrm{SO_2}

gas, in presence of charcoal, to give a product R. R reacts with white phosphorus to give a compound S. On hydrolysis, S gives an oxoacid of phosphorus, T. R, S and T, respectively, are

(A) $\mathrm{SO_2Cl_2}$ , $\mathrm{PCl_5}$ and $\mathrm{H_3PO_4}$
(B) $\mathrm{SO_2Cl_2}$ , $\mathrm{PCl_3}$ and $\mathrm{H_3PO_3}$
(C) $\mathrm{SOCl_2}$ , $\mathrm{PCl_3}$ and $\mathrm{H_3PO_2}$
(D) $\mathrm{SOCl_2}$ , $\mathrm{PCl_5}$ and $\mathrm{H_3PO_4}$

Q274·ChemistryMultiple correctJEE Advanced 2013

The correct statement(s) about

\mathrm{O_3}

is(are)

(A)O–O bond lengths are equal.
(B)Thermal decomposition of $\mathrm{O_3}$ is endothermic.
(C) $\mathrm{O_3}$ is diamagnetic in nature.
(D) $\mathrm{O_3}$ has a bent structure.

Q275·ChemistrySingle correctJEE Advanced 2013

The reactions of

\mathrm{Cl_2}

gas with cold-dilute and hot-concentrated NaOH in water give sodium salts of two (different) oxoacids of chlorine, P and Q, respectively. The

\mathrm{Cl_2}

gas reacts with

\mathrm{SO_2}

gas, in presence of charcoal, to give a product R. R reacts with white phosphorus to give a compound S. On hydrolysis, S gives an oxoacid of phosphorus, T. P and Q, respectively, are the sodium salts of

(A)hypochlorus and chloric acids
(B)hypochlorus and chlorus acids
(C)chloric and perchloric acids
(D)chloric and hypochlorus acids

Q276·ChemistrySingle correctJEE Advanced 2013

Concentrated nitric acid, upon long standing, turns yellow–brown due to the formation of

(A) $NO$
(B) $NO_2$
(C) $N_2O$
(D) $N_2O_4$

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